drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #ifdef CONFIG_PM
  48 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  49 #else
  50 #define MAYBE_CAP_SUSPEND       0
  51 #endif
  52
  53 #define USB_MAXBUS                      64
  54 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  55 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  56
  57 /* Mutual exclusion for ps->list in resume vs. release and remove */
  58 static DEFINE_MUTEX(usbfs_mutex);
  59
  60 struct usb_dev_state {
  61         struct list_head list;      /* state list */
  62         struct usb_device *dev;
  63         struct file *file;
  64         spinlock_t lock;            /* protects the async urb lists */
  65         struct list_head async_pending;
  66         struct list_head async_completed;
  67         struct list_head memory_list;
  68         wait_queue_head_t wait;     /* wake up if a request completed */
  69         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         sigval_t disccontext;
  74         unsigned long ifclaimed;
  75         u32 disabled_bulk_eps;
  76         unsigned long interface_allowed_mask;
  77         int not_yet_resumed;
  78         bool suspend_allowed;
  79         bool privileges_dropped;
  80 };
  81
  82 struct usb_memory {
  83         struct list_head memlist;
  84         int vma_use_count;
  85         int urb_use_count;
  86         u32 size;
  87         void *mem;
  88         dma_addr_t dma_handle;
  89         unsigned long vm_start;
  90         struct usb_dev_state *ps;
  91 };
  92
  93 struct async {
  94         struct list_head asynclist;
  95         struct usb_dev_state *ps;
  96         struct pid *pid;
  97         const struct cred *cred;
  98         unsigned int signr;
  99         unsigned int ifnum;
 100         void __user *userbuffer;
 101         void __user *userurb;
 102         sigval_t userurb_sigval;
 103         struct urb *urb;
 104         struct usb_memory *usbm;
 105         unsigned int mem_usage;
 106         int status;
 107         u8 bulk_addr;
 108         u8 bulk_status;
 109 };
 110
 111 static bool usbfs_snoop;
 112 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 113 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 114
 115 static unsigned usbfs_snoop_max = 65536;
 116 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 117 MODULE_PARM_DESC(usbfs_snoop_max,
 118                 "maximum number of bytes to print while snooping");
 119
 120 #define snoop(dev, format, arg...)                              \
 121         do {                                                    \
 122                 if (usbfs_snoop)                                \
 123                         dev_info(dev, format, ## arg);          \
 124         } while (0)
 125
 126 enum snoop_when {
 127         SUBMIT, COMPLETE
 128 };
 129
 130 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 131
 132 /* Limit on the total amount of memory we can allocate for transfers */
 133 static u32 usbfs_memory_mb = 16;
 134 module_param(usbfs_memory_mb, uint, 0644);
 135 MODULE_PARM_DESC(usbfs_memory_mb,
 136                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 137
 138 /* Hard limit, necessary to avoid arithmetic overflow */
 139 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 140
 141 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 142
 143 /* Check whether it's okay to allocate more memory for a transfer */
 144 static int usbfs_increase_memory_usage(u64 amount)
 145 {
 146         u64 lim;
 147
 148         lim = READ_ONCE(usbfs_memory_mb);
 149         lim <<= 20;
 150
 151         atomic64_add(amount, &usbfs_memory_usage);
 152
 153         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 154                 atomic64_sub(amount, &usbfs_memory_usage);
 155                 return -ENOMEM;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /* Memory for a transfer is being deallocated */
 162 static void usbfs_decrease_memory_usage(u64 amount)
 163 {
 164         atomic64_sub(amount, &usbfs_memory_usage);
 165 }
 166
 167 static int connected(struct usb_dev_state *ps)
 168 {
 169         return (!list_empty(&ps->list) &&
 170                         ps->dev->state != USB_STATE_NOTATTACHED);
 171 }
 172
 173 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 174 {
 175         struct usb_dev_state *ps = usbm->ps;
 176         unsigned long flags;
 177
 178         spin_lock_irqsave(&ps->lock, flags);
 179         --*count;
 180         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 181                 list_del(&usbm->memlist);
 182                 spin_unlock_irqrestore(&ps->lock, flags);
 183
 184                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 185                                 usbm->dma_handle);
 186                 usbfs_decrease_memory_usage(
 187                         usbm->size + sizeof(struct usb_memory));
 188                 kfree(usbm);
 189         } else {
 190                 spin_unlock_irqrestore(&ps->lock, flags);
 191         }
 192 }
 193
 194 static void usbdev_vm_open(struct vm_area_struct *vma)
 195 {
 196         struct usb_memory *usbm = vma->vm_private_data;
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&usbm->ps->lock, flags);
 200         ++usbm->vma_use_count;
 201         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 202 }
 203
 204 static void usbdev_vm_close(struct vm_area_struct *vma)
 205 {
 206         struct usb_memory *usbm = vma->vm_private_data;
 207
 208         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 209 }
 210
 211 static const struct vm_operations_struct usbdev_vm_ops = {
 212         .open = usbdev_vm_open,
 213         .close = usbdev_vm_close
 214 };
 215
 216 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 217 {
 218         struct usb_memory *usbm = NULL;
 219         struct usb_dev_state *ps = file->private_data;
 220         size_t size = vma->vm_end - vma->vm_start;
 221         void *mem;
 222         unsigned long flags;
 223         dma_addr_t dma_handle;
 224         int ret;
 225
 226         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 227         if (ret)
 228                 goto error;
 229
 230         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 231         if (!usbm) {
 232                 ret = -ENOMEM;
 233                 goto error_decrease_mem;
 234         }
 235
 236         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 237                         &dma_handle);
 238         if (!mem) {
 239                 ret = -ENOMEM;
 240                 goto error_free_usbm;
 241         }
 242
 243         memset(mem, 0, size);
 244
 245         usbm->mem = mem;
 246         usbm->dma_handle = dma_handle;
 247         usbm->size = size;
 248         usbm->ps = ps;
 249         usbm->vm_start = vma->vm_start;
 250         usbm->vma_use_count = 1;
 251         INIT_LIST_HEAD(&usbm->memlist);
 252
 253         if (remap_pfn_range(vma, vma->vm_start,
 254                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 255                         size, vma->vm_page_prot) < 0) {
 256                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 257                 return -EAGAIN;
 258         }
 259
 260         vma->vm_flags |= VM_IO;
 261         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 262         vma->vm_ops = &usbdev_vm_ops;
 263         vma->vm_private_data = usbm;
 264
 265         spin_lock_irqsave(&ps->lock, flags);
 266         list_add_tail(&usbm->memlist, &ps->memory_list);
 267         spin_unlock_irqrestore(&ps->lock, flags);
 268
 269         return 0;
 270
 271 error_free_usbm:
 272         kfree(usbm);
 273 error_decrease_mem:
 274         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 275 error:
 276         return ret;
 277 }
 278
 279 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 280                            loff_t *ppos)
 281 {
 282         struct usb_dev_state *ps = file->private_data;
 283         struct usb_device *dev = ps->dev;
 284         ssize_t ret = 0;
 285         unsigned len;
 286         loff_t pos;
 287         int i;
 288
 289         pos = *ppos;
 290         usb_lock_device(dev);
 291         if (!connected(ps)) {
 292                 ret = -ENODEV;
 293                 goto err;
 294         } else if (pos < 0) {
 295                 ret = -EINVAL;
 296                 goto err;
 297         }
 298
 299         if (pos < sizeof(struct usb_device_descriptor)) {
 300                 /* 18 bytes - fits on the stack */
 301                 struct usb_device_descriptor temp_desc;
 302
 303                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 304                 le16_to_cpus(&temp_desc.bcdUSB);
 305                 le16_to_cpus(&temp_desc.idVendor);
 306                 le16_to_cpus(&temp_desc.idProduct);
 307                 le16_to_cpus(&temp_desc.bcdDevice);
 308
 309                 len = sizeof(struct usb_device_descriptor) - pos;
 310                 if (len > nbytes)
 311                         len = nbytes;
 312                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 313                         ret = -EFAULT;
 314                         goto err;
 315                 }
 316
 317                 *ppos += len;
 318                 buf += len;
 319                 nbytes -= len;
 320                 ret += len;
 321         }
 322
 323         pos = sizeof(struct usb_device_descriptor);
 324         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 325                 struct usb_config_descriptor *config =
 326                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 327                 unsigned int length = le16_to_cpu(config->wTotalLength);
 328
 329                 if (*ppos < pos + length) {
 330
 331                         /* The descriptor may claim to be longer than it
 332                          * really is.  Here is the actual allocated length. */
 333                         unsigned alloclen =
 334                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 335
 336                         len = length - (*ppos - pos);
 337                         if (len > nbytes)
 338                                 len = nbytes;
 339
 340                         /* Simply don't write (skip over) unallocated parts */
 341                         if (alloclen > (*ppos - pos)) {
 342                                 alloclen -= (*ppos - pos);
 343                                 if (copy_to_user(buf,
 344                                     dev->rawdescriptors[i] + (*ppos - pos),
 345                                     min(len, alloclen))) {
 346                                         ret = -EFAULT;
 347                                         goto err;
 348                                 }
 349                         }
 350
 351                         *ppos += len;
 352                         buf += len;
 353                         nbytes -= len;
 354                         ret += len;
 355                 }
 356
 357                 pos += length;
 358         }
 359
 360 err:
 361         usb_unlock_device(dev);
 362         return ret;
 363 }
 364
 365 /*
 366  * async list handling
 367  */
 368
 369 static struct async *alloc_async(unsigned int numisoframes)
 370 {
 371         struct async *as;
 372
 373         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 374         if (!as)
 375                 return NULL;
 376         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 377         if (!as->urb) {
 378                 kfree(as);
 379                 return NULL;
 380         }
 381         return as;
 382 }
 383
 384 static void free_async(struct async *as)
 385 {
 386         int i;
 387
 388         put_pid(as->pid);
 389         if (as->cred)
 390                 put_cred(as->cred);
 391         for (i = 0; i < as->urb->num_sgs; i++) {
 392                 if (sg_page(&as->urb->sg[i]))
 393                         kfree(sg_virt(&as->urb->sg[i]));
 394         }
 395
 396         kfree(as->urb->sg);
 397         if (as->usbm == NULL)
 398                 kfree(as->urb->transfer_buffer);
 399         else
 400                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 401
 402         kfree(as->urb->setup_packet);
 403         usb_free_urb(as->urb);
 404         usbfs_decrease_memory_usage(as->mem_usage);
 405         kfree(as);
 406 }
 407
 408 static void async_newpending(struct async *as)
 409 {
 410         struct usb_dev_state *ps = as->ps;
 411         unsigned long flags;
 412
 413         spin_lock_irqsave(&ps->lock, flags);
 414         list_add_tail(&as->asynclist, &ps->async_pending);
 415         spin_unlock_irqrestore(&ps->lock, flags);
 416 }
 417
 418 static void async_removepending(struct async *as)
 419 {
 420         struct usb_dev_state *ps = as->ps;
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&ps->lock, flags);
 424         list_del_init(&as->asynclist);
 425         spin_unlock_irqrestore(&ps->lock, flags);
 426 }
 427
 428 static struct async *async_getcompleted(struct usb_dev_state *ps)
 429 {
 430         unsigned long flags;
 431         struct async *as = NULL;
 432
 433         spin_lock_irqsave(&ps->lock, flags);
 434         if (!list_empty(&ps->async_completed)) {
 435                 as = list_entry(ps->async_completed.next, struct async,
 436                                 asynclist);
 437                 list_del_init(&as->asynclist);
 438         }
 439         spin_unlock_irqrestore(&ps->lock, flags);
 440         return as;
 441 }
 442
 443 static struct async *async_getpending(struct usb_dev_state *ps,
 444                                              void __user *userurb)
 445 {
 446         struct async *as;
 447
 448         list_for_each_entry(as, &ps->async_pending, asynclist)
 449                 if (as->userurb == userurb) {
 450                         list_del_init(&as->asynclist);
 451                         return as;
 452                 }
 453
 454         return NULL;
 455 }
 456
 457 static void snoop_urb(struct usb_device *udev,
 458                 void __user *userurb, int pipe, unsigned length,
 459                 int timeout_or_status, enum snoop_when when,
 460                 unsigned char *data, unsigned data_len)
 461 {
 462         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 463         static const char *dirs[] = {"out", "in"};
 464         int ep;
 465         const char *t, *d;
 466
 467         if (!usbfs_snoop)
 468                 return;
 469
 470         ep = usb_pipeendpoint(pipe);
 471         t = types[usb_pipetype(pipe)];
 472         d = dirs[!!usb_pipein(pipe)];
 473
 474         if (userurb) {          /* Async */
 475                 if (when == SUBMIT)
 476                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 477                                         "length %u\n",
 478                                         userurb, ep, t, d, length);
 479                 else
 480                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 481                                         "actual_length %u status %d\n",
 482                                         userurb, ep, t, d, length,
 483                                         timeout_or_status);
 484         } else {
 485                 if (when == SUBMIT)
 486                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 487                                         "timeout %d\n",
 488                                         ep, t, d, length, timeout_or_status);
 489                 else
 490                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 491                                         "status %d\n",
 492                                         ep, t, d, length, timeout_or_status);
 493         }
 494
 495         data_len = min(data_len, usbfs_snoop_max);
 496         if (data && data_len > 0) {
 497                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 498                         data, data_len, 1);
 499         }
 500 }
 501
 502 static void snoop_urb_data(struct urb *urb, unsigned len)
 503 {
 504         int i, size;
 505
 506         len = min(len, usbfs_snoop_max);
 507         if (!usbfs_snoop || len == 0)
 508                 return;
 509
 510         if (urb->num_sgs == 0) {
 511                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 512                         urb->transfer_buffer, len, 1);
 513                 return;
 514         }
 515
 516         for (i = 0; i < urb->num_sgs && len; i++) {
 517                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 518                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 519                         sg_virt(&urb->sg[i]), size, 1);
 520                 len -= size;
 521         }
 522 }
 523
 524 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 525 {
 526         unsigned i, len, size;
 527
 528         if (urb->number_of_packets > 0)         /* Isochronous */
 529                 len = urb->transfer_buffer_length;
 530         else                                    /* Non-Isoc */
 531                 len = urb->actual_length;
 532
 533         if (urb->num_sgs == 0) {
 534                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 535                         return -EFAULT;
 536                 return 0;
 537         }
 538
 539         for (i = 0; i < urb->num_sgs && len; i++) {
 540                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 541                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 542                         return -EFAULT;
 543                 userbuffer += size;
 544                 len -= size;
 545         }
 546
 547         return 0;
 548 }
 549
 550 #define AS_CONTINUATION 1
 551 #define AS_UNLINK       2
 552
 553 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 554 __releases(ps->lock)
 555 __acquires(ps->lock)
 556 {
 557         struct urb *urb;
 558         struct async *as;
 559
 560         /* Mark all the pending URBs that match bulk_addr, up to but not
 561          * including the first one without AS_CONTINUATION.  If such an
 562          * URB is encountered then a new transfer has already started so
 563          * the endpoint doesn't need to be disabled; otherwise it does.
 564          */
 565         list_for_each_entry(as, &ps->async_pending, asynclist) {
 566                 if (as->bulk_addr == bulk_addr) {
 567                         if (as->bulk_status != AS_CONTINUATION)
 568                                 goto rescan;
 569                         as->bulk_status = AS_UNLINK;
 570                         as->bulk_addr = 0;
 571                 }
 572         }
 573         ps->disabled_bulk_eps |= (1 << bulk_addr);
 574
 575         /* Now carefully unlink all the marked pending URBs */
 576  rescan:
 577         list_for_each_entry(as, &ps->async_pending, asynclist) {
 578                 if (as->bulk_status == AS_UNLINK) {
 579                         as->bulk_status = 0;            /* Only once */
 580                         urb = as->urb;
 581                         usb_get_urb(urb);
 582                         spin_unlock(&ps->lock);         /* Allow completions */
 583                         usb_unlink_urb(urb);
 584                         usb_put_urb(urb);
 585                         spin_lock(&ps->lock);
 586                         goto rescan;
 587                 }
 588         }
 589 }
 590
 591 static void async_completed(struct urb *urb)
 592 {
 593         struct async *as = urb->context;
 594         struct usb_dev_state *ps = as->ps;
 595         struct pid *pid = NULL;
 596         const struct cred *cred = NULL;
 597         unsigned long flags;
 598         sigval_t addr;
 599         int signr, errno;
 600
 601         spin_lock_irqsave(&ps->lock, flags);
 602         list_move_tail(&as->asynclist, &ps->async_completed);
 603         as->status = urb->status;
 604         signr = as->signr;
 605         if (signr) {
 606                 errno = as->status;
 607                 addr = as->userurb_sigval;
 608                 pid = get_pid(as->pid);
 609                 cred = get_cred(as->cred);
 610         }
 611         snoop(&urb->dev->dev, "urb complete\n");
 612         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 613                         as->status, COMPLETE, NULL, 0);
 614         if (usb_urb_dir_in(urb))
 615                 snoop_urb_data(urb, urb->actual_length);
 616
 617         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 618                         as->status != -ENOENT)
 619                 cancel_bulk_urbs(ps, as->bulk_addr);
 620
 621         wake_up(&ps->wait);
 622         spin_unlock_irqrestore(&ps->lock, flags);
 623
 624         if (signr) {
 625                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 626                 put_pid(pid);
 627                 put_cred(cred);
 628         }
 629 }
 630
 631 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 632 {
 633         struct urb *urb;
 634         struct async *as;
 635         unsigned long flags;
 636
 637         spin_lock_irqsave(&ps->lock, flags);
 638         while (!list_empty(list)) {
 639                 as = list_entry(list->next, struct async, asynclist);
 640                 list_del_init(&as->asynclist);
 641                 urb = as->urb;
 642                 usb_get_urb(urb);
 643
 644                 /* drop the spinlock so the completion handler can run */
 645                 spin_unlock_irqrestore(&ps->lock, flags);
 646                 usb_kill_urb(urb);
 647                 usb_put_urb(urb);
 648                 spin_lock_irqsave(&ps->lock, flags);
 649         }
 650         spin_unlock_irqrestore(&ps->lock, flags);
 651 }
 652
 653 static void destroy_async_on_interface(struct usb_dev_state *ps,
 654                                        unsigned int ifnum)
 655 {
 656         struct list_head *p, *q, hitlist;
 657         unsigned long flags;
 658
 659         INIT_LIST_HEAD(&hitlist);
 660         spin_lock_irqsave(&ps->lock, flags);
 661         list_for_each_safe(p, q, &ps->async_pending)
 662                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 663                         list_move_tail(p, &hitlist);
 664         spin_unlock_irqrestore(&ps->lock, flags);
 665         destroy_async(ps, &hitlist);
 666 }
 667
 668 static void destroy_all_async(struct usb_dev_state *ps)
 669 {
 670         destroy_async(ps, &ps->async_pending);
 671 }
 672
 673 /*
 674  * interface claims are made only at the request of user level code,
 675  * which can also release them (explicitly or by closing files).
 676  * they're also undone when devices disconnect.
 677  */
 678
 679 static int driver_probe(struct usb_interface *intf,
 680                         const struct usb_device_id *id)
 681 {
 682         return -ENODEV;
 683 }
 684
 685 static void driver_disconnect(struct usb_interface *intf)
 686 {
 687         struct usb_dev_state *ps = usb_get_intfdata(intf);
 688         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 689
 690         if (!ps)
 691                 return;
 692
 693         /* NOTE:  this relies on usbcore having canceled and completed
 694          * all pending I/O requests; 2.6 does that.
 695          */
 696
 697         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 698                 clear_bit(ifnum, &ps->ifclaimed);
 699         else
 700                 dev_warn(&intf->dev, "interface number %u out of range\n",
 701                          ifnum);
 702
 703         usb_set_intfdata(intf, NULL);
 704
 705         /* force async requests to complete */
 706         destroy_async_on_interface(ps, ifnum);
 707 }
 708
 709 /* We don't care about suspend/resume of claimed interfaces */
 710 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 711 {
 712         return 0;
 713 }
 714
 715 static int driver_resume(struct usb_interface *intf)
 716 {
 717         return 0;
 718 }
 719
 720 /* The following routines apply to the entire device, not interfaces */
 721 void usbfs_notify_suspend(struct usb_device *udev)
 722 {
 723         /* We don't need to handle this */
 724 }
 725
 726 void usbfs_notify_resume(struct usb_device *udev)
 727 {
 728         struct usb_dev_state *ps;
 729
 730         /* Protect against simultaneous remove or release */
 731         mutex_lock(&usbfs_mutex);
 732         list_for_each_entry(ps, &udev->filelist, list) {
 733                 WRITE_ONCE(ps->not_yet_resumed, 0);
 734                 wake_up_all(&ps->wait_for_resume);
 735         }
 736         mutex_unlock(&usbfs_mutex);
 737 }
 738
 739 struct usb_driver usbfs_driver = {
 740         .name =         "usbfs",
 741         .probe =        driver_probe,
 742         .disconnect =   driver_disconnect,
 743         .suspend =      driver_suspend,
 744         .resume =       driver_resume,
 745         .supports_autosuspend = 1,
 746 };
 747
 748 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 749 {
 750         struct usb_device *dev = ps->dev;
 751         struct usb_interface *intf;
 752         int err;
 753
 754         if (ifnum >= 8*sizeof(ps->ifclaimed))
 755                 return -EINVAL;
 756         /* already claimed */
 757         if (test_bit(ifnum, &ps->ifclaimed))
 758                 return 0;
 759
 760         if (ps->privileges_dropped &&
 761                         !test_bit(ifnum, &ps->interface_allowed_mask))
 762                 return -EACCES;
 763
 764         intf = usb_ifnum_to_if(dev, ifnum);
 765         if (!intf)
 766                 err = -ENOENT;
 767         else {
 768                 unsigned int old_suppress;
 769
 770                 /* suppress uevents while claiming interface */
 771                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 772                 dev_set_uevent_suppress(&intf->dev, 1);
 773                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 774                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 775         }
 776         if (err == 0)
 777                 set_bit(ifnum, &ps->ifclaimed);
 778         return err;
 779 }
 780
 781 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 782 {
 783         struct usb_device *dev;
 784         struct usb_interface *intf;
 785         int err;
 786
 787         err = -EINVAL;
 788         if (ifnum >= 8*sizeof(ps->ifclaimed))
 789                 return err;
 790         dev = ps->dev;
 791         intf = usb_ifnum_to_if(dev, ifnum);
 792         if (!intf)
 793                 err = -ENOENT;
 794         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 795                 unsigned int old_suppress;
 796
 797                 /* suppress uevents while releasing interface */
 798                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 799                 dev_set_uevent_suppress(&intf->dev, 1);
 800                 usb_driver_release_interface(&usbfs_driver, intf);
 801                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 802                 err = 0;
 803         }
 804         return err;
 805 }
 806
 807 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 808 {
 809         if (ps->dev->state != USB_STATE_CONFIGURED)
 810                 return -EHOSTUNREACH;
 811         if (ifnum >= 8*sizeof(ps->ifclaimed))
 812                 return -EINVAL;
 813         if (test_bit(ifnum, &ps->ifclaimed))
 814                 return 0;
 815         /* if not yet claimed, claim it for the driver */
 816         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 817                  "interface %u before use\n", task_pid_nr(current),
 818                  current->comm, ifnum);
 819         return claimintf(ps, ifnum);
 820 }
 821
 822 static int findintfep(struct usb_device *dev, unsigned int ep)
 823 {
 824         unsigned int i, j, e;
 825         struct usb_interface *intf;
 826         struct usb_host_interface *alts;
 827         struct usb_endpoint_descriptor *endpt;
 828
 829         if (ep & ~(USB_DIR_IN|0xf))
 830                 return -EINVAL;
 831         if (!dev->actconfig)
 832                 return -ESRCH;
 833         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 834                 intf = dev->actconfig->interface[i];
 835                 for (j = 0; j < intf->num_altsetting; j++) {
 836                         alts = &intf->altsetting[j];
 837                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 838                                 endpt = &alts->endpoint[e].desc;
 839                                 if (endpt->bEndpointAddress == ep)
 840                                         return alts->desc.bInterfaceNumber;
 841                         }
 842                 }
 843         }
 844         return -ENOENT;
 845 }
 846
 847 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 848                            unsigned int request, unsigned int index)
 849 {
 850         int ret = 0;
 851         struct usb_host_interface *alt_setting;
 852
 853         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 854          && ps->dev->state != USB_STATE_ADDRESS
 855          && ps->dev->state != USB_STATE_CONFIGURED)
 856                 return -EHOSTUNREACH;
 857         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 858                 return 0;
 859
 860         /*
 861          * check for the special corner case 'get_device_id' in the printer
 862          * class specification, which we always want to allow as it is used
 863          * to query things like ink level, etc.
 864          */
 865         if (requesttype == 0xa1 && request == 0) {
 866                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 867                                                    index >> 8, index & 0xff);
 868                 if (alt_setting
 869                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 870                         return 0;
 871         }
 872
 873         index &= 0xff;
 874         switch (requesttype & USB_RECIP_MASK) {
 875         case USB_RECIP_ENDPOINT:
 876                 if ((index & ~USB_DIR_IN) == 0)
 877                         return 0;
 878                 ret = findintfep(ps->dev, index);
 879                 if (ret < 0) {
 880                         /*
 881                          * Some not fully compliant Win apps seem to get
 882                          * index wrong and have the endpoint number here
 883                          * rather than the endpoint address (with the
 884                          * correct direction). Win does let this through,
 885                          * so we'll not reject it here but leave it to
 886                          * the device to not break KVM. But we warn.
 887                          */
 888                         ret = findintfep(ps->dev, index ^ 0x80);
 889                         if (ret >= 0)
 890                                 dev_info(&ps->dev->dev,
 891                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 892                                         __func__, task_pid_nr(current),
 893                                         current->comm, index, index ^ 0x80);
 894                 }
 895                 if (ret >= 0)
 896                         ret = checkintf(ps, ret);
 897                 break;
 898
 899         case USB_RECIP_INTERFACE:
 900                 ret = checkintf(ps, index);
 901                 break;
 902         }
 903         return ret;
 904 }
 905
 906 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 907                                                      unsigned char ep)
 908 {
 909         if (ep & USB_ENDPOINT_DIR_MASK)
 910                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 911         else
 912                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 913 }
 914
 915 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 916                                   struct usbdevfs_streams __user *streams,
 917                                   unsigned int *num_streams_ret,
 918                                   unsigned int *num_eps_ret,
 919                                   struct usb_host_endpoint ***eps_ret,
 920                                   struct usb_interface **intf_ret)
 921 {
 922         unsigned int i, num_streams, num_eps;
 923         struct usb_host_endpoint **eps;
 924         struct usb_interface *intf = NULL;
 925         unsigned char ep;
 926         int ifnum, ret;
 927
 928         if (get_user(num_streams, &streams->num_streams) ||
 929             get_user(num_eps, &streams->num_eps))
 930                 return -EFAULT;
 931
 932         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 933                 return -EINVAL;
 934
 935         /* The XHCI controller allows max 2 ^ 16 streams */
 936         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 937                 return -EINVAL;
 938
 939         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 940         if (!eps)
 941                 return -ENOMEM;
 942
 943         for (i = 0; i < num_eps; i++) {
 944                 if (get_user(ep, &streams->eps[i])) {
 945                         ret = -EFAULT;
 946                         goto error;
 947                 }
 948                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 949                 if (!eps[i]) {
 950                         ret = -EINVAL;
 951                         goto error;
 952                 }
 953
 954                 /* usb_alloc/free_streams operate on an usb_interface */
 955                 ifnum = findintfep(ps->dev, ep);
 956                 if (ifnum < 0) {
 957                         ret = ifnum;
 958                         goto error;
 959                 }
 960
 961                 if (i == 0) {
 962                         ret = checkintf(ps, ifnum);
 963                         if (ret < 0)
 964                                 goto error;
 965                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 966                 } else {
 967                         /* Verify all eps belong to the same interface */
 968                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 969                                 ret = -EINVAL;
 970                                 goto error;
 971                         }
 972                 }
 973         }
 974
 975         if (num_streams_ret)
 976                 *num_streams_ret = num_streams;
 977         *num_eps_ret = num_eps;
 978         *eps_ret = eps;
 979         *intf_ret = intf;
 980
 981         return 0;
 982
 983 error:
 984         kfree(eps);
 985         return ret;
 986 }
 987
 988 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 989 {
 990         struct device *dev;
 991
 992         dev = bus_find_device_by_devt(&usb_bus_type, devt);
 993         if (!dev)
 994                 return NULL;
 995         return to_usb_device(dev);
 996 }
 997
 998 /*
 999  * file operations
1000  */
1001 static int usbdev_open(struct inode *inode, struct file *file)
1002 {
1003         struct usb_device *dev = NULL;
1004         struct usb_dev_state *ps;
1005         int ret;
1006
1007         ret = -ENOMEM;
1008         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1009         if (!ps)
1010                 goto out_free_ps;
1011
1012         ret = -ENODEV;
1013
1014         /* usbdev device-node */
1015         if (imajor(inode) == USB_DEVICE_MAJOR)
1016                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1017         if (!dev)
1018                 goto out_free_ps;
1019
1020         usb_lock_device(dev);
1021         if (dev->state == USB_STATE_NOTATTACHED)
1022                 goto out_unlock_device;
1023
1024         ret = usb_autoresume_device(dev);
1025         if (ret)
1026                 goto out_unlock_device;
1027
1028         ps->dev = dev;
1029         ps->file = file;
1030         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1031         spin_lock_init(&ps->lock);
1032         INIT_LIST_HEAD(&ps->list);
1033         INIT_LIST_HEAD(&ps->async_pending);
1034         INIT_LIST_HEAD(&ps->async_completed);
1035         INIT_LIST_HEAD(&ps->memory_list);
1036         init_waitqueue_head(&ps->wait);
1037         init_waitqueue_head(&ps->wait_for_resume);
1038         ps->disc_pid = get_pid(task_pid(current));
1039         ps->cred = get_current_cred();
1040         smp_wmb();
1041
1042         /* Can't race with resume; the device is already active */
1043         list_add_tail(&ps->list, &dev->filelist);
1044         file->private_data = ps;
1045         usb_unlock_device(dev);
1046         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1047                         current->comm);
1048         return ret;
1049
1050  out_unlock_device:
1051         usb_unlock_device(dev);
1052         usb_put_dev(dev);
1053  out_free_ps:
1054         kfree(ps);
1055         return ret;
1056 }
1057
1058 static int usbdev_release(struct inode *inode, struct file *file)
1059 {
1060         struct usb_dev_state *ps = file->private_data;
1061         struct usb_device *dev = ps->dev;
1062         unsigned int ifnum;
1063         struct async *as;
1064
1065         usb_lock_device(dev);
1066         usb_hub_release_all_ports(dev, ps);
1067
1068         /* Protect against simultaneous resume */
1069         mutex_lock(&usbfs_mutex);
1070         list_del_init(&ps->list);
1071         mutex_unlock(&usbfs_mutex);
1072
1073         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1074                         ifnum++) {
1075                 if (test_bit(ifnum, &ps->ifclaimed))
1076                         releaseintf(ps, ifnum);
1077         }
1078         destroy_all_async(ps);
1079         if (!ps->suspend_allowed)
1080                 usb_autosuspend_device(dev);
1081         usb_unlock_device(dev);
1082         usb_put_dev(dev);
1083         put_pid(ps->disc_pid);
1084         put_cred(ps->cred);
1085
1086         as = async_getcompleted(ps);
1087         while (as) {
1088                 free_async(as);
1089                 as = async_getcompleted(ps);
1090         }
1091
1092         kfree(ps);
1093         return 0;
1094 }
1095
1096 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1097 {
1098         struct usb_device *dev = ps->dev;
1099         struct usbdevfs_ctrltransfer ctrl;
1100         unsigned int tmo;
1101         unsigned char *tbuf;
1102         unsigned wLength;
1103         int i, pipe, ret;
1104
1105         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1106                 return -EFAULT;
1107         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1108                               ctrl.wIndex);
1109         if (ret)
1110                 return ret;
1111         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1112         if (wLength > PAGE_SIZE)
1113                 return -EINVAL;
1114         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1115                         sizeof(struct usb_ctrlrequest));
1116         if (ret)
1117                 return ret;
1118         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1119         if (!tbuf) {
1120                 ret = -ENOMEM;
1121                 goto done;
1122         }
1123         tmo = ctrl.timeout;
1124         snoop(&dev->dev, "control urb: bRequestType=%02x "
1125                 "bRequest=%02x wValue=%04x "
1126                 "wIndex=%04x wLength=%04x\n",
1127                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1128                 ctrl.wIndex, ctrl.wLength);
1129         if (ctrl.bRequestType & 0x80) {
1130                 if (ctrl.wLength && !access_ok(ctrl.data,
1131                                                ctrl.wLength)) {
1132                         ret = -EINVAL;
1133                         goto done;
1134                 }
1135                 pipe = usb_rcvctrlpipe(dev, 0);
1136                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1137
1138                 usb_unlock_device(dev);
1139                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1140                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1141                                     tbuf, ctrl.wLength, tmo);
1142                 usb_lock_device(dev);
1143                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1144                           tbuf, max(i, 0));
1145                 if ((i > 0) && ctrl.wLength) {
1146                         if (copy_to_user(ctrl.data, tbuf, i)) {
1147                                 ret = -EFAULT;
1148                                 goto done;
1149                         }
1150                 }
1151         } else {
1152                 if (ctrl.wLength) {
1153                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1154                                 ret = -EFAULT;
1155                                 goto done;
1156                         }
1157                 }
1158                 pipe = usb_sndctrlpipe(dev, 0);
1159                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1160                         tbuf, ctrl.wLength);
1161
1162                 usb_unlock_device(dev);
1163                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1164                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1165                                     tbuf, ctrl.wLength, tmo);
1166                 usb_lock_device(dev);
1167                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1168         }
1169         if (i < 0 && i != -EPIPE) {
1170                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1171                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1172                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1173                            ctrl.wLength, i);
1174         }
1175         ret = i;
1176  done:
1177         free_page((unsigned long) tbuf);
1178         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1179                         sizeof(struct usb_ctrlrequest));
1180         return ret;
1181 }
1182
1183 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1184 {
1185         struct usb_device *dev = ps->dev;
1186         struct usbdevfs_bulktransfer bulk;
1187         unsigned int tmo, len1, pipe;
1188         int len2;
1189         unsigned char *tbuf;
1190         int i, ret;
1191
1192         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1193                 return -EFAULT;
1194         ret = findintfep(ps->dev, bulk.ep);
1195         if (ret < 0)
1196                 return ret;
1197         ret = checkintf(ps, ret);
1198         if (ret)
1199                 return ret;
1200         if (bulk.ep & USB_DIR_IN)
1201                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1202         else
1203                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1204         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1205                 return -EINVAL;
1206         len1 = bulk.len;
1207         if (len1 >= (INT_MAX - sizeof(struct urb)))
1208                 return -EINVAL;
1209         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1210         if (ret)
1211                 return ret;
1212         tbuf = kmalloc(len1, GFP_KERNEL);
1213         if (!tbuf) {
1214                 ret = -ENOMEM;
1215                 goto done;
1216         }
1217         tmo = bulk.timeout;
1218         if (bulk.ep & 0x80) {
1219                 if (len1 && !access_ok(bulk.data, len1)) {
1220                         ret = -EINVAL;
1221                         goto done;
1222                 }
1223                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1224
1225                 usb_unlock_device(dev);
1226                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1227                 usb_lock_device(dev);
1228                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1229
1230                 if (!i && len2) {
1231                         if (copy_to_user(bulk.data, tbuf, len2)) {
1232                                 ret = -EFAULT;
1233                                 goto done;
1234                         }
1235                 }
1236         } else {
1237                 if (len1) {
1238                         if (copy_from_user(tbuf, bulk.data, len1)) {
1239                                 ret = -EFAULT;
1240                                 goto done;
1241                         }
1242                 }
1243                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1244
1245                 usb_unlock_device(dev);
1246                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1247                 usb_lock_device(dev);
1248                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1249         }
1250         ret = (i < 0 ? i : len2);
1251  done:
1252         kfree(tbuf);
1253         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1254         return ret;
1255 }
1256
1257 static void check_reset_of_active_ep(struct usb_device *udev,
1258                 unsigned int epnum, char *ioctl_name)
1259 {
1260         struct usb_host_endpoint **eps;
1261         struct usb_host_endpoint *ep;
1262
1263         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1264         ep = eps[epnum & 0x0f];
1265         if (ep && !list_empty(&ep->urb_list))
1266                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1267                                 task_pid_nr(current), current->comm,
1268                                 ioctl_name, epnum);
1269 }
1270
1271 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1272 {
1273         unsigned int ep;
1274         int ret;
1275
1276         if (get_user(ep, (unsigned int __user *)arg))
1277                 return -EFAULT;
1278         ret = findintfep(ps->dev, ep);
1279         if (ret < 0)
1280                 return ret;
1281         ret = checkintf(ps, ret);
1282         if (ret)
1283                 return ret;
1284         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1285         usb_reset_endpoint(ps->dev, ep);
1286         return 0;
1287 }
1288
1289 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1290 {
1291         unsigned int ep;
1292         int pipe;
1293         int ret;
1294
1295         if (get_user(ep, (unsigned int __user *)arg))
1296                 return -EFAULT;
1297         ret = findintfep(ps->dev, ep);
1298         if (ret < 0)
1299                 return ret;
1300         ret = checkintf(ps, ret);
1301         if (ret)
1302                 return ret;
1303         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1304         if (ep & USB_DIR_IN)
1305                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1306         else
1307                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1308
1309         return usb_clear_halt(ps->dev, pipe);
1310 }
1311
1312 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1313 {
1314         struct usbdevfs_getdriver gd;
1315         struct usb_interface *intf;
1316         int ret;
1317
1318         if (copy_from_user(&gd, arg, sizeof(gd)))
1319                 return -EFAULT;
1320         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1321         if (!intf || !intf->dev.driver)
1322                 ret = -ENODATA;
1323         else {
1324                 strlcpy(gd.driver, intf->dev.driver->name,
1325                                 sizeof(gd.driver));
1326                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1327         }
1328         return ret;
1329 }
1330
1331 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1332 {
1333         struct usbdevfs_connectinfo ci;
1334
1335         memset(&ci, 0, sizeof(ci));
1336         ci.devnum = ps->dev->devnum;
1337         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1338
1339         if (copy_to_user(arg, &ci, sizeof(ci)))
1340                 return -EFAULT;
1341         return 0;
1342 }
1343
1344 static int proc_conninfo_ex(struct usb_dev_state *ps,
1345                             void __user *arg, size_t size)
1346 {
1347         struct usbdevfs_conninfo_ex ci;
1348         struct usb_device *udev = ps->dev;
1349
1350         if (size < sizeof(ci.size))
1351                 return -EINVAL;
1352
1353         memset(&ci, 0, sizeof(ci));
1354         ci.size = sizeof(ci);
1355         ci.busnum = udev->bus->busnum;
1356         ci.devnum = udev->devnum;
1357         ci.speed = udev->speed;
1358
1359         while (udev && udev->portnum != 0) {
1360                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1361                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1362                                         udev->portnum;
1363                 udev = udev->parent;
1364         }
1365
1366         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1367                 memmove(&ci.ports[0],
1368                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1369                         ci.num_ports);
1370
1371         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1372                 return -EFAULT;
1373
1374         return 0;
1375 }
1376
1377 static int proc_resetdevice(struct usb_dev_state *ps)
1378 {
1379         struct usb_host_config *actconfig = ps->dev->actconfig;
1380         struct usb_interface *interface;
1381         int i, number;
1382
1383         /* Don't allow a device reset if the process has dropped the
1384          * privilege to do such things and any of the interfaces are
1385          * currently claimed.
1386          */
1387         if (ps->privileges_dropped && actconfig) {
1388                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1389                         interface = actconfig->interface[i];
1390                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1391                         if (usb_interface_claimed(interface) &&
1392                                         !test_bit(number, &ps->ifclaimed)) {
1393                                 dev_warn(&ps->dev->dev,
1394                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1395                                         number, interface->dev.driver->name, current->comm);
1396                                 return -EACCES;
1397                         }
1398                 }
1399         }
1400
1401         return usb_reset_device(ps->dev);
1402 }
1403
1404 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1405 {
1406         struct usbdevfs_setinterface setintf;
1407         int ret;
1408
1409         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1410                 return -EFAULT;
1411         ret = checkintf(ps, setintf.interface);
1412         if (ret)
1413                 return ret;
1414
1415         destroy_async_on_interface(ps, setintf.interface);
1416
1417         return usb_set_interface(ps->dev, setintf.interface,
1418                         setintf.altsetting);
1419 }
1420
1421 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1422 {
1423         int u;
1424         int status = 0;
1425         struct usb_host_config *actconfig;
1426
1427         if (get_user(u, (int __user *)arg))
1428                 return -EFAULT;
1429
1430         actconfig = ps->dev->actconfig;
1431
1432         /* Don't touch the device if any interfaces are claimed.
1433          * It could interfere with other drivers' operations, and if
1434          * an interface is claimed by usbfs it could easily deadlock.
1435          */
1436         if (actconfig) {
1437                 int i;
1438
1439                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1440                         if (usb_interface_claimed(actconfig->interface[i])) {
1441                                 dev_warn(&ps->dev->dev,
1442                                         "usbfs: interface %d claimed by %s "
1443                                         "while '%s' sets config #%d\n",
1444                                         actconfig->interface[i]
1445                                                 ->cur_altsetting
1446                                                 ->desc.bInterfaceNumber,
1447                                         actconfig->interface[i]
1448                                                 ->dev.driver->name,
1449                                         current->comm, u);
1450                                 status = -EBUSY;
1451                                 break;
1452                         }
1453                 }
1454         }
1455
1456         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1457          * so avoid usb_set_configuration()'s kick to sysfs
1458          */
1459         if (status == 0) {
1460                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1461                         status = usb_reset_configuration(ps->dev);
1462                 else
1463                         status = usb_set_configuration(ps->dev, u);
1464         }
1465
1466         return status;
1467 }
1468
1469 static struct usb_memory *
1470 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1471 {
1472         struct usb_memory *usbm = NULL, *iter;
1473         unsigned long flags;
1474         unsigned long uurb_start = (unsigned long)uurb->buffer;
1475
1476         spin_lock_irqsave(&ps->lock, flags);
1477         list_for_each_entry(iter, &ps->memory_list, memlist) {
1478                 if (uurb_start >= iter->vm_start &&
1479                                 uurb_start < iter->vm_start + iter->size) {
1480                         if (uurb->buffer_length > iter->vm_start + iter->size -
1481                                         uurb_start) {
1482                                 usbm = ERR_PTR(-EINVAL);
1483                         } else {
1484                                 usbm = iter;
1485                                 usbm->urb_use_count++;
1486                         }
1487                         break;
1488                 }
1489         }
1490         spin_unlock_irqrestore(&ps->lock, flags);
1491         return usbm;
1492 }
1493
1494 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1495                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1496                         void __user *arg, sigval_t userurb_sigval)
1497 {
1498         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1499         struct usb_host_endpoint *ep;
1500         struct async *as = NULL;
1501         struct usb_ctrlrequest *dr = NULL;
1502         unsigned int u, totlen, isofrmlen;
1503         int i, ret, num_sgs = 0, ifnum = -1;
1504         int number_of_packets = 0;
1505         unsigned int stream_id = 0;
1506         void *buf;
1507         bool is_in;
1508         bool allow_short = false;
1509         bool allow_zero = false;
1510         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1511                                 USBDEVFS_URB_BULK_CONTINUATION |
1512                                 USBDEVFS_URB_NO_FSBR |
1513                                 USBDEVFS_URB_ZERO_PACKET |
1514                                 USBDEVFS_URB_NO_INTERRUPT;
1515         /* USBDEVFS_URB_ISO_ASAP is a special case */
1516         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1517                 mask |= USBDEVFS_URB_ISO_ASAP;
1518
1519         if (uurb->flags & ~mask)
1520                         return -EINVAL;
1521
1522         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1523                 return -EINVAL;
1524         if (uurb->buffer_length > 0 && !uurb->buffer)
1525                 return -EINVAL;
1526         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1527             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1528                 ifnum = findintfep(ps->dev, uurb->endpoint);
1529                 if (ifnum < 0)
1530                         return ifnum;
1531                 ret = checkintf(ps, ifnum);
1532                 if (ret)
1533                         return ret;
1534         }
1535         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1536         if (!ep)
1537                 return -ENOENT;
1538         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1539
1540         u = 0;
1541         switch (uurb->type) {
1542         case USBDEVFS_URB_TYPE_CONTROL:
1543                 if (!usb_endpoint_xfer_control(&ep->desc))
1544                         return -EINVAL;
1545                 /* min 8 byte setup packet */
1546                 if (uurb->buffer_length < 8)
1547                         return -EINVAL;
1548                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1549                 if (!dr)
1550                         return -ENOMEM;
1551                 if (copy_from_user(dr, uurb->buffer, 8)) {
1552                         ret = -EFAULT;
1553                         goto error;
1554                 }
1555                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1556                         ret = -EINVAL;
1557                         goto error;
1558                 }
1559                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1560                                       le16_to_cpu(dr->wIndex));
1561                 if (ret)
1562                         goto error;
1563                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1564                 uurb->buffer += 8;
1565                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1566                         is_in = true;
1567                         uurb->endpoint |= USB_DIR_IN;
1568                 } else {
1569                         is_in = false;
1570                         uurb->endpoint &= ~USB_DIR_IN;
1571                 }
1572                 if (is_in)
1573                         allow_short = true;
1574                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1575                         "bRequest=%02x wValue=%04x "
1576                         "wIndex=%04x wLength=%04x\n",
1577                         dr->bRequestType, dr->bRequest,
1578                         __le16_to_cpu(dr->wValue),
1579                         __le16_to_cpu(dr->wIndex),
1580                         __le16_to_cpu(dr->wLength));
1581                 u = sizeof(struct usb_ctrlrequest);
1582                 break;
1583
1584         case USBDEVFS_URB_TYPE_BULK:
1585                 if (!is_in)
1586                         allow_zero = true;
1587                 else
1588                         allow_short = true;
1589                 switch (usb_endpoint_type(&ep->desc)) {
1590                 case USB_ENDPOINT_XFER_CONTROL:
1591                 case USB_ENDPOINT_XFER_ISOC:
1592                         return -EINVAL;
1593                 case USB_ENDPOINT_XFER_INT:
1594                         /* allow single-shot interrupt transfers */
1595                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1596                         goto interrupt_urb;
1597                 }
1598                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1599                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1600                         num_sgs = 0;
1601                 if (ep->streams)
1602                         stream_id = uurb->stream_id;
1603                 break;
1604
1605         case USBDEVFS_URB_TYPE_INTERRUPT:
1606                 if (!usb_endpoint_xfer_int(&ep->desc))
1607                         return -EINVAL;
1608  interrupt_urb:
1609                 if (!is_in)
1610                         allow_zero = true;
1611                 else
1612                         allow_short = true;
1613                 break;
1614
1615         case USBDEVFS_URB_TYPE_ISO:
1616                 /* arbitrary limit */
1617                 if (uurb->number_of_packets < 1 ||
1618                     uurb->number_of_packets > 128)
1619                         return -EINVAL;
1620                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1621                         return -EINVAL;
1622                 number_of_packets = uurb->number_of_packets;
1623                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1624                                    number_of_packets;
1625                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1626                 if (IS_ERR(isopkt)) {
1627                         ret = PTR_ERR(isopkt);
1628                         isopkt = NULL;
1629                         goto error;
1630                 }
1631                 for (totlen = u = 0; u < number_of_packets; u++) {
1632                         /*
1633                          * arbitrary limit need for USB 3.1 Gen2
1634                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1635                          */
1636                         if (isopkt[u].length > 98304) {
1637                                 ret = -EINVAL;
1638                                 goto error;
1639                         }
1640                         totlen += isopkt[u].length;
1641                 }
1642                 u *= sizeof(struct usb_iso_packet_descriptor);
1643                 uurb->buffer_length = totlen;
1644                 break;
1645
1646         default:
1647                 return -EINVAL;
1648         }
1649
1650         if (uurb->buffer_length > 0 &&
1651                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1652                 ret = -EFAULT;
1653                 goto error;
1654         }
1655         as = alloc_async(number_of_packets);
1656         if (!as) {
1657                 ret = -ENOMEM;
1658                 goto error;
1659         }
1660
1661         as->usbm = find_memory_area(ps, uurb);
1662         if (IS_ERR(as->usbm)) {
1663                 ret = PTR_ERR(as->usbm);
1664                 as->usbm = NULL;
1665                 goto error;
1666         }
1667
1668         /* do not use SG buffers when memory mapped segments
1669          * are in use
1670          */
1671         if (as->usbm)
1672                 num_sgs = 0;
1673
1674         u += sizeof(struct async) + sizeof(struct urb) +
1675              (as->usbm ? 0 : uurb->buffer_length) +
1676              num_sgs * sizeof(struct scatterlist);
1677         ret = usbfs_increase_memory_usage(u);
1678         if (ret)
1679                 goto error;
1680         as->mem_usage = u;
1681
1682         if (num_sgs) {
1683                 as->urb->sg = kmalloc_array(num_sgs,
1684                                             sizeof(struct scatterlist),
1685                                             GFP_KERNEL);
1686                 if (!as->urb->sg) {
1687                         ret = -ENOMEM;
1688                         goto error;
1689                 }
1690                 as->urb->num_sgs = num_sgs;
1691                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1692
1693                 totlen = uurb->buffer_length;
1694                 for (i = 0; i < as->urb->num_sgs; i++) {
1695                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1696                         buf = kmalloc(u, GFP_KERNEL);
1697                         if (!buf) {
1698                                 ret = -ENOMEM;
1699                                 goto error;
1700                         }
1701                         sg_set_buf(&as->urb->sg[i], buf, u);
1702
1703                         if (!is_in) {
1704                                 if (copy_from_user(buf, uurb->buffer, u)) {
1705                                         ret = -EFAULT;
1706                                         goto error;
1707                                 }
1708                                 uurb->buffer += u;
1709                         }
1710                         totlen -= u;
1711                 }
1712         } else if (uurb->buffer_length > 0) {
1713                 if (as->usbm) {
1714                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1715
1716                         as->urb->transfer_buffer = as->usbm->mem +
1717                                         (uurb_start - as->usbm->vm_start);
1718                 } else {
1719                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1720                                         GFP_KERNEL);
1721                         if (!as->urb->transfer_buffer) {
1722                                 ret = -ENOMEM;
1723                                 goto error;
1724                         }
1725                         if (!is_in) {
1726                                 if (copy_from_user(as->urb->transfer_buffer,
1727                                                    uurb->buffer,
1728                                                    uurb->buffer_length)) {
1729                                         ret = -EFAULT;
1730                                         goto error;
1731                                 }
1732                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1733                                 /*
1734                                  * Isochronous input data may end up being
1735                                  * discontiguous if some of the packets are
1736                                  * short. Clear the buffer so that the gaps
1737                                  * don't leak kernel data to userspace.
1738                                  */
1739                                 memset(as->urb->transfer_buffer, 0,
1740                                                 uurb->buffer_length);
1741                         }
1742                 }
1743         }
1744         as->urb->dev = ps->dev;
1745         as->urb->pipe = (uurb->type << 30) |
1746                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1747                         (uurb->endpoint & USB_DIR_IN);
1748
1749         /* This tedious sequence is necessary because the URB_* flags
1750          * are internal to the kernel and subject to change, whereas
1751          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1752          */
1753         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1754         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1755                 u |= URB_ISO_ASAP;
1756         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1757                 u |= URB_SHORT_NOT_OK;
1758         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1759                 u |= URB_ZERO_PACKET;
1760         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1761                 u |= URB_NO_INTERRUPT;
1762         as->urb->transfer_flags = u;
1763
1764         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1765                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1766         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1767                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1768
1769         as->urb->transfer_buffer_length = uurb->buffer_length;
1770         as->urb->setup_packet = (unsigned char *)dr;
1771         dr = NULL;
1772         as->urb->start_frame = uurb->start_frame;
1773         as->urb->number_of_packets = number_of_packets;
1774         as->urb->stream_id = stream_id;
1775
1776         if (ep->desc.bInterval) {
1777                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1778                                 ps->dev->speed == USB_SPEED_HIGH ||
1779                                 ps->dev->speed >= USB_SPEED_SUPER)
1780                         as->urb->interval = 1 <<
1781                                         min(15, ep->desc.bInterval - 1);
1782                 else
1783                         as->urb->interval = ep->desc.bInterval;
1784         }
1785
1786         as->urb->context = as;
1787         as->urb->complete = async_completed;
1788         for (totlen = u = 0; u < number_of_packets; u++) {
1789                 as->urb->iso_frame_desc[u].offset = totlen;
1790                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1791                 totlen += isopkt[u].length;
1792         }
1793         kfree(isopkt);
1794         isopkt = NULL;
1795         as->ps = ps;
1796         as->userurb = arg;
1797         as->userurb_sigval = userurb_sigval;
1798         if (as->usbm) {
1799                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1800
1801                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1802                 as->urb->transfer_dma = as->usbm->dma_handle +
1803                                 (uurb_start - as->usbm->vm_start);
1804         } else if (is_in && uurb->buffer_length > 0)
1805                 as->userbuffer = uurb->buffer;
1806         as->signr = uurb->signr;
1807         as->ifnum = ifnum;
1808         as->pid = get_pid(task_pid(current));
1809         as->cred = get_current_cred();
1810         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1811                         as->urb->transfer_buffer_length, 0, SUBMIT,
1812                         NULL, 0);
1813         if (!is_in)
1814                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1815
1816         async_newpending(as);
1817
1818         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1819                 spin_lock_irq(&ps->lock);
1820
1821                 /* Not exactly the endpoint address; the direction bit is
1822                  * shifted to the 0x10 position so that the value will be
1823                  * between 0 and 31.
1824                  */
1825                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1826                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1827                                 >> 3);
1828
1829                 /* If this bulk URB is the start of a new transfer, re-enable
1830                  * the endpoint.  Otherwise mark it as a continuation URB.
1831                  */
1832                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1833                         as->bulk_status = AS_CONTINUATION;
1834                 else
1835                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1836
1837                 /* Don't accept continuation URBs if the endpoint is
1838                  * disabled because of an earlier error.
1839                  */
1840                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1841                         ret = -EREMOTEIO;
1842                 else
1843                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1844                 spin_unlock_irq(&ps->lock);
1845         } else {
1846                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1847         }
1848
1849         if (ret) {
1850                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1851                            "usbfs: usb_submit_urb returned %d\n", ret);
1852                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1853                                 0, ret, COMPLETE, NULL, 0);
1854                 async_removepending(as);
1855                 goto error;
1856         }
1857         return 0;
1858
1859  error:
1860         kfree(isopkt);
1861         kfree(dr);
1862         if (as)
1863                 free_async(as);
1864         return ret;
1865 }
1866
1867 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1868 {
1869         struct usbdevfs_urb uurb;
1870         sigval_t userurb_sigval;
1871
1872         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1873                 return -EFAULT;
1874
1875         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1876         userurb_sigval.sival_ptr = arg;
1877
1878         return proc_do_submiturb(ps, &uurb,
1879                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1880                         arg, userurb_sigval);
1881 }
1882
1883 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1884 {
1885         struct urb *urb;
1886         struct async *as;
1887         unsigned long flags;
1888
1889         spin_lock_irqsave(&ps->lock, flags);
1890         as = async_getpending(ps, arg);
1891         if (!as) {
1892                 spin_unlock_irqrestore(&ps->lock, flags);
1893                 return -EINVAL;
1894         }
1895
1896         urb = as->urb;
1897         usb_get_urb(urb);
1898         spin_unlock_irqrestore(&ps->lock, flags);
1899
1900         usb_kill_urb(urb);
1901         usb_put_urb(urb);
1902
1903         return 0;
1904 }
1905
1906 static void compute_isochronous_actual_length(struct urb *urb)
1907 {
1908         unsigned int i;
1909
1910         if (urb->number_of_packets > 0) {
1911                 urb->actual_length = 0;
1912                 for (i = 0; i < urb->number_of_packets; i++)
1913                         urb->actual_length +=
1914                                         urb->iso_frame_desc[i].actual_length;
1915         }
1916 }
1917
1918 static int processcompl(struct async *as, void __user * __user *arg)
1919 {
1920         struct urb *urb = as->urb;
1921         struct usbdevfs_urb __user *userurb = as->userurb;
1922         void __user *addr = as->userurb;
1923         unsigned int i;
1924
1925         compute_isochronous_actual_length(urb);
1926         if (as->userbuffer && urb->actual_length) {
1927                 if (copy_urb_data_to_user(as->userbuffer, urb))
1928                         goto err_out;
1929         }
1930         if (put_user(as->status, &userurb->status))
1931                 goto err_out;
1932         if (put_user(urb->actual_length, &userurb->actual_length))
1933                 goto err_out;
1934         if (put_user(urb->error_count, &userurb->error_count))
1935                 goto err_out;
1936
1937         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1938                 for (i = 0; i < urb->number_of_packets; i++) {
1939                         if (put_user(urb->iso_frame_desc[i].actual_length,
1940                                      &userurb->iso_frame_desc[i].actual_length))
1941                                 goto err_out;
1942                         if (put_user(urb->iso_frame_desc[i].status,
1943                                      &userurb->iso_frame_desc[i].status))
1944                                 goto err_out;
1945                 }
1946         }
1947
1948         if (put_user(addr, (void __user * __user *)arg))
1949                 return -EFAULT;
1950         return 0;
1951
1952 err_out:
1953         return -EFAULT;
1954 }
1955
1956 static struct async *reap_as(struct usb_dev_state *ps)
1957 {
1958         DECLARE_WAITQUEUE(wait, current);
1959         struct async *as = NULL;
1960         struct usb_device *dev = ps->dev;
1961
1962         add_wait_queue(&ps->wait, &wait);
1963         for (;;) {
1964                 __set_current_state(TASK_INTERRUPTIBLE);
1965                 as = async_getcompleted(ps);
1966                 if (as || !connected(ps))
1967                         break;
1968                 if (signal_pending(current))
1969                         break;
1970                 usb_unlock_device(dev);
1971                 schedule();
1972                 usb_lock_device(dev);
1973         }
1974         remove_wait_queue(&ps->wait, &wait);
1975         set_current_state(TASK_RUNNING);
1976         return as;
1977 }
1978
1979 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1980 {
1981         struct async *as = reap_as(ps);
1982
1983         if (as) {
1984                 int retval;
1985
1986                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1987                 retval = processcompl(as, (void __user * __user *)arg);
1988                 free_async(as);
1989                 return retval;
1990         }
1991         if (signal_pending(current))
1992                 return -EINTR;
1993         return -ENODEV;
1994 }
1995
1996 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1997 {
1998         int retval;
1999         struct async *as;
2000
2001         as = async_getcompleted(ps);
2002         if (as) {
2003                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2004                 retval = processcompl(as, (void __user * __user *)arg);
2005                 free_async(as);
2006         } else {
2007                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2008         }
2009         return retval;
2010 }
2011
2012 #ifdef CONFIG_COMPAT
2013 static int proc_control_compat(struct usb_dev_state *ps,
2014                                 struct usbdevfs_ctrltransfer32 __user *p32)
2015 {
2016         struct usbdevfs_ctrltransfer __user *p;
2017         __u32 udata;
2018         p = compat_alloc_user_space(sizeof(*p));
2019         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
2020             get_user(udata, &p32->data) ||
2021             put_user(compat_ptr(udata), &p->data))
2022                 return -EFAULT;
2023         return proc_control(ps, p);
2024 }
2025
2026 static int proc_bulk_compat(struct usb_dev_state *ps,
2027                         struct usbdevfs_bulktransfer32 __user *p32)
2028 {
2029         struct usbdevfs_bulktransfer __user *p;
2030         compat_uint_t n;
2031         compat_caddr_t addr;
2032
2033         p = compat_alloc_user_space(sizeof(*p));
2034
2035         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
2036             get_user(n, &p32->len) || put_user(n, &p->len) ||
2037             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
2038             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
2039                 return -EFAULT;
2040
2041         return proc_bulk(ps, p);
2042 }
2043 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2044 {
2045         struct usbdevfs_disconnectsignal32 ds;
2046
2047         if (copy_from_user(&ds, arg, sizeof(ds)))
2048                 return -EFAULT;
2049         ps->discsignr = ds.signr;
2050         ps->disccontext.sival_int = ds.context;
2051         return 0;
2052 }
2053
2054 static int get_urb32(struct usbdevfs_urb *kurb,
2055                      struct usbdevfs_urb32 __user *uurb)
2056 {
2057         struct usbdevfs_urb32 urb32;
2058         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2059                 return -EFAULT;
2060         kurb->type = urb32.type;
2061         kurb->endpoint = urb32.endpoint;
2062         kurb->status = urb32.status;
2063         kurb->flags = urb32.flags;
2064         kurb->buffer = compat_ptr(urb32.buffer);
2065         kurb->buffer_length = urb32.buffer_length;
2066         kurb->actual_length = urb32.actual_length;
2067         kurb->start_frame = urb32.start_frame;
2068         kurb->number_of_packets = urb32.number_of_packets;
2069         kurb->error_count = urb32.error_count;
2070         kurb->signr = urb32.signr;
2071         kurb->usercontext = compat_ptr(urb32.usercontext);
2072         return 0;
2073 }
2074
2075 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2076 {
2077         struct usbdevfs_urb uurb;
2078         sigval_t userurb_sigval;
2079
2080         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2081                 return -EFAULT;
2082
2083         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2084         userurb_sigval.sival_int = ptr_to_compat(arg);
2085
2086         return proc_do_submiturb(ps, &uurb,
2087                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2088                         arg, userurb_sigval);
2089 }
2090
2091 static int processcompl_compat(struct async *as, void __user * __user *arg)
2092 {
2093         struct urb *urb = as->urb;
2094         struct usbdevfs_urb32 __user *userurb = as->userurb;
2095         void __user *addr = as->userurb;
2096         unsigned int i;
2097
2098         compute_isochronous_actual_length(urb);
2099         if (as->userbuffer && urb->actual_length) {
2100                 if (copy_urb_data_to_user(as->userbuffer, urb))
2101                         return -EFAULT;
2102         }
2103         if (put_user(as->status, &userurb->status))
2104                 return -EFAULT;
2105         if (put_user(urb->actual_length, &userurb->actual_length))
2106                 return -EFAULT;
2107         if (put_user(urb->error_count, &userurb->error_count))
2108                 return -EFAULT;
2109
2110         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2111                 for (i = 0; i < urb->number_of_packets; i++) {
2112                         if (put_user(urb->iso_frame_desc[i].actual_length,
2113                                      &userurb->iso_frame_desc[i].actual_length))
2114                                 return -EFAULT;
2115                         if (put_user(urb->iso_frame_desc[i].status,
2116                                      &userurb->iso_frame_desc[i].status))
2117                                 return -EFAULT;
2118                 }
2119         }
2120
2121         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2122                 return -EFAULT;
2123         return 0;
2124 }
2125
2126 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2127 {
2128         struct async *as = reap_as(ps);
2129
2130         if (as) {
2131                 int retval;
2132
2133                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2134                 retval = processcompl_compat(as, (void __user * __user *)arg);
2135                 free_async(as);
2136                 return retval;
2137         }
2138         if (signal_pending(current))
2139                 return -EINTR;
2140         return -ENODEV;
2141 }
2142
2143 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2144 {
2145         int retval;
2146         struct async *as;
2147
2148         as = async_getcompleted(ps);
2149         if (as) {
2150                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2151                 retval = processcompl_compat(as, (void __user * __user *)arg);
2152                 free_async(as);
2153         } else {
2154                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2155         }
2156         return retval;
2157 }
2158
2159
2160 #endif
2161
2162 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2163 {
2164         struct usbdevfs_disconnectsignal ds;
2165
2166         if (copy_from_user(&ds, arg, sizeof(ds)))
2167                 return -EFAULT;
2168         ps->discsignr = ds.signr;
2169         ps->disccontext.sival_ptr = ds.context;
2170         return 0;
2171 }
2172
2173 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2174 {
2175         unsigned int ifnum;
2176
2177         if (get_user(ifnum, (unsigned int __user *)arg))
2178                 return -EFAULT;
2179         return claimintf(ps, ifnum);
2180 }
2181
2182 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2183 {
2184         unsigned int ifnum;
2185         int ret;
2186
2187         if (get_user(ifnum, (unsigned int __user *)arg))
2188                 return -EFAULT;
2189         ret = releaseintf(ps, ifnum);
2190         if (ret < 0)
2191                 return ret;
2192         destroy_async_on_interface(ps, ifnum);
2193         return 0;
2194 }
2195
2196 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2197 {
2198         int                     size;
2199         void                    *buf = NULL;
2200         int                     retval = 0;
2201         struct usb_interface    *intf = NULL;
2202         struct usb_driver       *driver = NULL;
2203
2204         if (ps->privileges_dropped)
2205                 return -EACCES;
2206
2207         if (!connected(ps))
2208                 return -ENODEV;
2209
2210         /* alloc buffer */
2211         size = _IOC_SIZE(ctl->ioctl_code);
2212         if (size > 0) {
2213                 buf = kmalloc(size, GFP_KERNEL);
2214                 if (buf == NULL)
2215                         return -ENOMEM;
2216                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2217                         if (copy_from_user(buf, ctl->data, size)) {
2218                                 kfree(buf);
2219                                 return -EFAULT;
2220                         }
2221                 } else {
2222                         memset(buf, 0, size);
2223                 }
2224         }
2225
2226         if (ps->dev->state != USB_STATE_CONFIGURED)
2227                 retval = -EHOSTUNREACH;
2228         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2229                 retval = -EINVAL;
2230         else switch (ctl->ioctl_code) {
2231
2232         /* disconnect kernel driver from interface */
2233         case USBDEVFS_DISCONNECT:
2234                 if (intf->dev.driver) {
2235                         driver = to_usb_driver(intf->dev.driver);
2236                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2237                         usb_driver_release_interface(driver, intf);
2238                 } else
2239                         retval = -ENODATA;
2240                 break;
2241
2242         /* let kernel drivers try to (re)bind to the interface */
2243         case USBDEVFS_CONNECT:
2244                 if (!intf->dev.driver)
2245                         retval = device_attach(&intf->dev);
2246                 else
2247                         retval = -EBUSY;
2248                 break;
2249
2250         /* talk directly to the interface's driver */
2251         default:
2252                 if (intf->dev.driver)
2253                         driver = to_usb_driver(intf->dev.driver);
2254                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2255                         retval = -ENOTTY;
2256                 } else {
2257                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2258                         if (retval == -ENOIOCTLCMD)
2259                                 retval = -ENOTTY;
2260                 }
2261         }
2262
2263         /* cleanup and return */
2264         if (retval >= 0
2265                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2266                         && size > 0
2267                         && copy_to_user(ctl->data, buf, size) != 0)
2268                 retval = -EFAULT;
2269
2270         kfree(buf);
2271         return retval;
2272 }
2273
2274 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2275 {
2276         struct usbdevfs_ioctl   ctrl;
2277
2278         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2279                 return -EFAULT;
2280         return proc_ioctl(ps, &ctrl);
2281 }
2282
2283 #ifdef CONFIG_COMPAT
2284 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2285 {
2286         struct usbdevfs_ioctl32 ioc32;
2287         struct usbdevfs_ioctl ctrl;
2288
2289         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2290                 return -EFAULT;
2291         ctrl.ifno = ioc32.ifno;
2292         ctrl.ioctl_code = ioc32.ioctl_code;
2293         ctrl.data = compat_ptr(ioc32.data);
2294         return proc_ioctl(ps, &ctrl);
2295 }
2296 #endif
2297
2298 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2299 {
2300         unsigned portnum;
2301         int rc;
2302
2303         if (get_user(portnum, (unsigned __user *) arg))
2304                 return -EFAULT;
2305         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2306         if (rc == 0)
2307                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2308                         portnum, task_pid_nr(current), current->comm);
2309         return rc;
2310 }
2311
2312 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2313 {
2314         unsigned portnum;
2315
2316         if (get_user(portnum, (unsigned __user *) arg))
2317                 return -EFAULT;
2318         return usb_hub_release_port(ps->dev, portnum, ps);
2319 }
2320
2321 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2322 {
2323         __u32 caps;
2324
2325         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2326                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2327                         USBDEVFS_CAP_DROP_PRIVILEGES |
2328                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2329         if (!ps->dev->bus->no_stop_on_short)
2330                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2331         if (ps->dev->bus->sg_tablesize)
2332                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2333
2334         if (put_user(caps, (__u32 __user *)arg))
2335                 return -EFAULT;
2336
2337         return 0;
2338 }
2339
2340 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2341 {
2342         struct usbdevfs_disconnect_claim dc;
2343         struct usb_interface *intf;
2344
2345         if (copy_from_user(&dc, arg, sizeof(dc)))
2346                 return -EFAULT;
2347
2348         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2349         if (!intf)
2350                 return -EINVAL;
2351
2352         if (intf->dev.driver) {
2353                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2354
2355                 if (ps->privileges_dropped)
2356                         return -EACCES;
2357
2358                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2359                                 strncmp(dc.driver, intf->dev.driver->name,
2360                                         sizeof(dc.driver)) != 0)
2361                         return -EBUSY;
2362
2363                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2364                                 strncmp(dc.driver, intf->dev.driver->name,
2365                                         sizeof(dc.driver)) == 0)
2366                         return -EBUSY;
2367
2368                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2369                 usb_driver_release_interface(driver, intf);
2370         }
2371
2372         return claimintf(ps, dc.interface);
2373 }
2374
2375 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2376 {
2377         unsigned num_streams, num_eps;
2378         struct usb_host_endpoint **eps;
2379         struct usb_interface *intf;
2380         int r;
2381
2382         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2383                                    &eps, &intf);
2384         if (r)
2385                 return r;
2386
2387         destroy_async_on_interface(ps,
2388                                    intf->altsetting[0].desc.bInterfaceNumber);
2389
2390         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2391         kfree(eps);
2392         return r;
2393 }
2394
2395 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2396 {
2397         unsigned num_eps;
2398         struct usb_host_endpoint **eps;
2399         struct usb_interface *intf;
2400         int r;
2401
2402         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2403         if (r)
2404                 return r;
2405
2406         destroy_async_on_interface(ps,
2407                                    intf->altsetting[0].desc.bInterfaceNumber);
2408
2409         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2410         kfree(eps);
2411         return r;
2412 }
2413
2414 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2415 {
2416         u32 data;
2417
2418         if (copy_from_user(&data, arg, sizeof(data)))
2419                 return -EFAULT;
2420
2421         /* This is a one way operation. Once privileges are
2422          * dropped, you cannot regain them. You may however reissue
2423          * this ioctl to shrink the allowed interfaces mask.
2424          */
2425         ps->interface_allowed_mask &= data;
2426         ps->privileges_dropped = true;
2427
2428         return 0;
2429 }
2430
2431 static int proc_forbid_suspend(struct usb_dev_state *ps)
2432 {
2433         int ret = 0;
2434
2435         if (ps->suspend_allowed) {
2436                 ret = usb_autoresume_device(ps->dev);
2437                 if (ret == 0)
2438                         ps->suspend_allowed = false;
2439                 else if (ret != -ENODEV)
2440                         ret = -EIO;
2441         }
2442         return ret;
2443 }
2444
2445 static int proc_allow_suspend(struct usb_dev_state *ps)
2446 {
2447         if (!connected(ps))
2448                 return -ENODEV;
2449
2450         WRITE_ONCE(ps->not_yet_resumed, 1);
2451         if (!ps->suspend_allowed) {
2452                 usb_autosuspend_device(ps->dev);
2453                 ps->suspend_allowed = true;
2454         }
2455         return 0;
2456 }
2457
2458 static int proc_wait_for_resume(struct usb_dev_state *ps)
2459 {
2460         int ret;
2461
2462         usb_unlock_device(ps->dev);
2463         ret = wait_event_interruptible(ps->wait_for_resume,
2464                         READ_ONCE(ps->not_yet_resumed) == 0);
2465         usb_lock_device(ps->dev);
2466
2467         if (ret != 0)
2468                 return -EINTR;
2469         return proc_forbid_suspend(ps);
2470 }
2471
2472 /*
2473  * NOTE:  All requests here that have interface numbers as parameters
2474  * are assuming that somehow the configuration has been prevented from
2475  * changing.  But there's no mechanism to ensure that...
2476  */
2477 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2478                                 void __user *p)
2479 {
2480         struct usb_dev_state *ps = file->private_data;
2481         struct inode *inode = file_inode(file);
2482         struct usb_device *dev = ps->dev;
2483         int ret = -ENOTTY;
2484
2485         if (!(file->f_mode & FMODE_WRITE))
2486                 return -EPERM;
2487
2488         usb_lock_device(dev);
2489
2490         /* Reap operations are allowed even after disconnection */
2491         switch (cmd) {
2492         case USBDEVFS_REAPURB:
2493                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2494                 ret = proc_reapurb(ps, p);
2495                 goto done;
2496
2497         case USBDEVFS_REAPURBNDELAY:
2498                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2499                 ret = proc_reapurbnonblock(ps, p);
2500                 goto done;
2501
2502 #ifdef CONFIG_COMPAT
2503         case USBDEVFS_REAPURB32:
2504                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2505                 ret = proc_reapurb_compat(ps, p);
2506                 goto done;
2507
2508         case USBDEVFS_REAPURBNDELAY32:
2509                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2510                 ret = proc_reapurbnonblock_compat(ps, p);
2511                 goto done;
2512 #endif
2513         }
2514
2515         if (!connected(ps)) {
2516                 usb_unlock_device(dev);
2517                 return -ENODEV;
2518         }
2519
2520         switch (cmd) {
2521         case USBDEVFS_CONTROL:
2522                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2523                 ret = proc_control(ps, p);
2524                 if (ret >= 0)
2525                         inode->i_mtime = current_time(inode);
2526                 break;
2527
2528         case USBDEVFS_BULK:
2529                 snoop(&dev->dev, "%s: BULK\n", __func__);
2530                 ret = proc_bulk(ps, p);
2531                 if (ret >= 0)
2532                         inode->i_mtime = current_time(inode);
2533                 break;
2534
2535         case USBDEVFS_RESETEP:
2536                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2537                 ret = proc_resetep(ps, p);
2538                 if (ret >= 0)
2539                         inode->i_mtime = current_time(inode);
2540                 break;
2541
2542         case USBDEVFS_RESET:
2543                 snoop(&dev->dev, "%s: RESET\n", __func__);
2544                 ret = proc_resetdevice(ps);
2545                 break;
2546
2547         case USBDEVFS_CLEAR_HALT:
2548                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2549                 ret = proc_clearhalt(ps, p);
2550                 if (ret >= 0)
2551                         inode->i_mtime = current_time(inode);
2552                 break;
2553
2554         case USBDEVFS_GETDRIVER:
2555                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2556                 ret = proc_getdriver(ps, p);
2557                 break;
2558
2559         case USBDEVFS_CONNECTINFO:
2560                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2561                 ret = proc_connectinfo(ps, p);
2562                 break;
2563
2564         case USBDEVFS_SETINTERFACE:
2565                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2566                 ret = proc_setintf(ps, p);
2567                 break;
2568
2569         case USBDEVFS_SETCONFIGURATION:
2570                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2571                 ret = proc_setconfig(ps, p);
2572                 break;
2573
2574         case USBDEVFS_SUBMITURB:
2575                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2576                 ret = proc_submiturb(ps, p);
2577                 if (ret >= 0)
2578                         inode->i_mtime = current_time(inode);
2579                 break;
2580
2581 #ifdef CONFIG_COMPAT
2582         case USBDEVFS_CONTROL32:
2583                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2584                 ret = proc_control_compat(ps, p);
2585                 if (ret >= 0)
2586                         inode->i_mtime = current_time(inode);
2587                 break;
2588
2589         case USBDEVFS_BULK32:
2590                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2591                 ret = proc_bulk_compat(ps, p);
2592                 if (ret >= 0)
2593                         inode->i_mtime = current_time(inode);
2594                 break;
2595
2596         case USBDEVFS_DISCSIGNAL32:
2597                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2598                 ret = proc_disconnectsignal_compat(ps, p);
2599                 break;
2600
2601         case USBDEVFS_SUBMITURB32:
2602                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2603                 ret = proc_submiturb_compat(ps, p);
2604                 if (ret >= 0)
2605                         inode->i_mtime = current_time(inode);
2606                 break;
2607
2608         case USBDEVFS_IOCTL32:
2609                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2610                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2611                 break;
2612 #endif
2613
2614         case USBDEVFS_DISCARDURB:
2615                 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2616                 ret = proc_unlinkurb(ps, p);
2617                 break;
2618
2619         case USBDEVFS_DISCSIGNAL:
2620                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2621                 ret = proc_disconnectsignal(ps, p);
2622                 break;
2623
2624         case USBDEVFS_CLAIMINTERFACE:
2625                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2626                 ret = proc_claiminterface(ps, p);
2627                 break;
2628
2629         case USBDEVFS_RELEASEINTERFACE:
2630                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2631                 ret = proc_releaseinterface(ps, p);
2632                 break;
2633
2634         case USBDEVFS_IOCTL:
2635                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2636                 ret = proc_ioctl_default(ps, p);
2637                 break;
2638
2639         case USBDEVFS_CLAIM_PORT:
2640                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2641                 ret = proc_claim_port(ps, p);
2642                 break;
2643
2644         case USBDEVFS_RELEASE_PORT:
2645                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2646                 ret = proc_release_port(ps, p);
2647                 break;
2648         case USBDEVFS_GET_CAPABILITIES:
2649                 ret = proc_get_capabilities(ps, p);
2650                 break;
2651         case USBDEVFS_DISCONNECT_CLAIM:
2652                 ret = proc_disconnect_claim(ps, p);
2653                 break;
2654         case USBDEVFS_ALLOC_STREAMS:
2655                 ret = proc_alloc_streams(ps, p);
2656                 break;
2657         case USBDEVFS_FREE_STREAMS:
2658                 ret = proc_free_streams(ps, p);
2659                 break;
2660         case USBDEVFS_DROP_PRIVILEGES:
2661                 ret = proc_drop_privileges(ps, p);
2662                 break;
2663         case USBDEVFS_GET_SPEED:
2664                 ret = ps->dev->speed;
2665                 break;
2666         case USBDEVFS_FORBID_SUSPEND:
2667                 ret = proc_forbid_suspend(ps);
2668                 break;
2669         case USBDEVFS_ALLOW_SUSPEND:
2670                 ret = proc_allow_suspend(ps);
2671                 break;
2672         case USBDEVFS_WAIT_FOR_RESUME:
2673                 ret = proc_wait_for_resume(ps);
2674                 break;
2675         }
2676
2677         /* Handle variable-length commands */
2678         switch (cmd & ~IOCSIZE_MASK) {
2679         case USBDEVFS_CONNINFO_EX(0):
2680                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2681                 break;
2682         }
2683
2684  done:
2685         usb_unlock_device(dev);
2686         if (ret >= 0)
2687                 inode->i_atime = current_time(inode);
2688         return ret;
2689 }
2690
2691 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2692                         unsigned long arg)
2693 {
2694         int ret;
2695
2696         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2697
2698         return ret;
2699 }
2700
2701 /* No kernel lock - fine */
2702 static __poll_t usbdev_poll(struct file *file,
2703                                 struct poll_table_struct *wait)
2704 {
2705         struct usb_dev_state *ps = file->private_data;
2706         __poll_t mask = 0;
2707
2708         poll_wait(file, &ps->wait, wait);
2709         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2710                 mask |= EPOLLOUT | EPOLLWRNORM;
2711         if (!connected(ps))
2712                 mask |= EPOLLHUP;
2713         if (list_empty(&ps->list))
2714                 mask |= EPOLLERR;
2715         return mask;
2716 }
2717
2718 const struct file_operations usbdev_file_operations = {
2719         .owner =          THIS_MODULE,
2720         .llseek =         no_seek_end_llseek,
2721         .read =           usbdev_read,
2722         .poll =           usbdev_poll,
2723         .unlocked_ioctl = usbdev_ioctl,
2724         .compat_ioctl =   compat_ptr_ioctl,
2725         .mmap =           usbdev_mmap,
2726         .open =           usbdev_open,
2727         .release =        usbdev_release,
2728 };
2729
2730 static void usbdev_remove(struct usb_device *udev)
2731 {
2732         struct usb_dev_state *ps;
2733
2734         /* Protect against simultaneous resume */
2735         mutex_lock(&usbfs_mutex);
2736         while (!list_empty(&udev->filelist)) {
2737                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2738                 destroy_all_async(ps);
2739                 wake_up_all(&ps->wait);
2740                 WRITE_ONCE(ps->not_yet_resumed, 0);
2741                 wake_up_all(&ps->wait_for_resume);
2742                 list_del_init(&ps->list);
2743                 if (ps->discsignr)
2744                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2745                                              ps->disc_pid, ps->cred);
2746         }
2747         mutex_unlock(&usbfs_mutex);
2748 }
2749
2750 static int usbdev_notify(struct notifier_block *self,
2751                                unsigned long action, void *dev)
2752 {
2753         switch (action) {
2754         case USB_DEVICE_ADD:
2755                 break;
2756         case USB_DEVICE_REMOVE:
2757                 usbdev_remove(dev);
2758                 break;
2759         }
2760         return NOTIFY_OK;
2761 }
2762
2763 static struct notifier_block usbdev_nb = {
2764         .notifier_call =        usbdev_notify,
2765 };
2766
2767 static struct cdev usb_device_cdev;
2768
2769 int __init usb_devio_init(void)
2770 {
2771         int retval;
2772
2773         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2774                                         "usb_device");
2775         if (retval) {
2776                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2777                 goto out;
2778         }
2779         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2780         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2781         if (retval) {
2782                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2783                        USB_DEVICE_MAJOR);
2784                 goto error_cdev;
2785         }
2786         usb_register_notify(&usbdev_nb);
2787 out:
2788         return retval;
2789
2790 error_cdev:
2791         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2792         goto out;
2793 }
2794
2795 void usb_devio_cleanup(void)
2796 {
2797         usb_unregister_notify(&usbdev_nb);
2798         cdev_del(&usb_device_cdev);
2799         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2800 }