drivers/usb/storage/uas.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * USB Attached SCSI
   4  * Note that this is not the same as the USB Mass Storage driver
   5  *
   6  * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
   7  * Copyright Matthew Wilcox for Intel Corp, 2010
   8  * Copyright Sarah Sharp for Intel Corp, 2010
   9  */
  10
  11 #include <linux/blkdev.h>
  12 #include <linux/slab.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb_usual.h>
  17 #include <linux/usb/hcd.h>
  18 #include <linux/usb/storage.h>
  19 #include <linux/usb/uas.h>
  20
  21 #include <scsi/scsi.h>
  22 #include <scsi/scsi_eh.h>
  23 #include <scsi/scsi_dbg.h>
  24 #include <scsi/scsi_cmnd.h>
  25 #include <scsi/scsi_device.h>
  26 #include <scsi/scsi_host.h>
  27 #include <scsi/scsi_tcq.h>
  28
  29 #include "uas-detect.h"
  30 #include "scsiglue.h"
  31
  32 #define MAX_CMNDS 256
  33
  34 struct uas_dev_info {
  35         struct usb_interface *intf;
  36         struct usb_device *udev;
  37         struct usb_anchor cmd_urbs;
  38         struct usb_anchor sense_urbs;
  39         struct usb_anchor data_urbs;
  40         unsigned long flags;
  41         int qdepth, resetting;
  42         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  43         unsigned use_streams:1;
  44         unsigned shutdown:1;
  45         struct scsi_cmnd *cmnd[MAX_CMNDS];
  46         spinlock_t lock;
  47         struct work_struct work;
  48 };
  49
  50 enum {
  51         SUBMIT_STATUS_URB       = BIT(1),
  52         ALLOC_DATA_IN_URB       = BIT(2),
  53         SUBMIT_DATA_IN_URB      = BIT(3),
  54         ALLOC_DATA_OUT_URB      = BIT(4),
  55         SUBMIT_DATA_OUT_URB     = BIT(5),
  56         ALLOC_CMD_URB           = BIT(6),
  57         SUBMIT_CMD_URB          = BIT(7),
  58         COMMAND_INFLIGHT        = BIT(8),
  59         DATA_IN_URB_INFLIGHT    = BIT(9),
  60         DATA_OUT_URB_INFLIGHT   = BIT(10),
  61         COMMAND_ABORTED         = BIT(11),
  62         IS_IN_WORK_LIST         = BIT(12),
  63 };
  64
  65 /* Overrides scsi_pointer */
  66 struct uas_cmd_info {
  67         unsigned int state;
  68         unsigned int uas_tag;
  69         struct urb *cmd_urb;
  70         struct urb *data_in_urb;
  71         struct urb *data_out_urb;
  72 };
  73
  74 /* I hate forward declarations, but I actually have a loop */
  75 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  76                                 struct uas_dev_info *devinfo);
  77 static void uas_do_work(struct work_struct *work);
  78 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  79 static void uas_free_streams(struct uas_dev_info *devinfo);
  80 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
  81                                 int status);
  82
  83 static void uas_do_work(struct work_struct *work)
  84 {
  85         struct uas_dev_info *devinfo =
  86                 container_of(work, struct uas_dev_info, work);
  87         struct uas_cmd_info *cmdinfo;
  88         struct scsi_cmnd *cmnd;
  89         unsigned long flags;
  90         int i, err;
  91
  92         spin_lock_irqsave(&devinfo->lock, flags);
  93
  94         if (devinfo->resetting)
  95                 goto out;
  96
  97         for (i = 0; i < devinfo->qdepth; i++) {
  98                 if (!devinfo->cmnd[i])
  99                         continue;
 100
 101                 cmnd = devinfo->cmnd[i];
 102                 cmdinfo = (void *)&cmnd->SCp;
 103
 104                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 105                         continue;
 106
 107                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 108                 if (!err)
 109                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 110                 else
 111                         schedule_work(&devinfo->work);
 112         }
 113 out:
 114         spin_unlock_irqrestore(&devinfo->lock, flags);
 115 }
 116
 117 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 118 {
 119         struct scsi_pointer *scp = (void *)cmdinfo;
 120         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 121         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 122
 123         lockdep_assert_held(&devinfo->lock);
 124         cmdinfo->state |= IS_IN_WORK_LIST;
 125         schedule_work(&devinfo->work);
 126 }
 127
 128 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
 129 {
 130         struct uas_cmd_info *cmdinfo;
 131         struct scsi_cmnd *cmnd;
 132         unsigned long flags;
 133         int i, err;
 134
 135         spin_lock_irqsave(&devinfo->lock, flags);
 136         for (i = 0; i < devinfo->qdepth; i++) {
 137                 if (!devinfo->cmnd[i])
 138                         continue;
 139
 140                 cmnd = devinfo->cmnd[i];
 141                 cmdinfo = (void *)&cmnd->SCp;
 142                 uas_log_cmd_state(cmnd, __func__, 0);
 143                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
 144                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 145                 cmnd->result = result << 16;
 146                 err = uas_try_complete(cmnd, __func__);
 147                 WARN_ON(err != 0);
 148         }
 149         spin_unlock_irqrestore(&devinfo->lock, flags);
 150 }
 151
 152 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 153 {
 154         struct sense_iu *sense_iu = urb->transfer_buffer;
 155         struct scsi_device *sdev = cmnd->device;
 156
 157         if (urb->actual_length > 16) {
 158                 unsigned len = be16_to_cpup(&sense_iu->len);
 159                 if (len + 16 != urb->actual_length) {
 160                         int newlen = min(len + 16, urb->actual_length) - 16;
 161                         if (newlen < 0)
 162                                 newlen = 0;
 163                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 164                                 "disagrees with IU sense data length %d, "
 165                                 "using %d bytes of sense data\n", __func__,
 166                                         urb->actual_length, len, newlen);
 167                         len = newlen;
 168                 }
 169                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 170         }
 171
 172         cmnd->result = sense_iu->status;
 173 }
 174
 175 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
 176                               int status)
 177 {
 178         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 179         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 180
 181         scmd_printk(KERN_INFO, cmnd,
 182                     "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
 183                     prefix, status, cmdinfo->uas_tag,
 184                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 185                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 186                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 187                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 188                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 189                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 190                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 191                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 192                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 193                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 194                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 195                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 196         scsi_print_command(cmnd);
 197 }
 198
 199 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
 200 {
 201         struct uas_cmd_info *cmdinfo;
 202
 203         if (!cmnd)
 204                 return;
 205
 206         cmdinfo = (void *)&cmnd->SCp;
 207
 208         if (cmdinfo->state & SUBMIT_CMD_URB)
 209                 usb_free_urb(cmdinfo->cmd_urb);
 210
 211         /* data urbs may have never gotten their submit flag set */
 212         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
 213                 usb_free_urb(cmdinfo->data_in_urb);
 214         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
 215                 usb_free_urb(cmdinfo->data_out_urb);
 216 }
 217
 218 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 219 {
 220         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 221         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 222
 223         lockdep_assert_held(&devinfo->lock);
 224         if (cmdinfo->state & (COMMAND_INFLIGHT |
 225                               DATA_IN_URB_INFLIGHT |
 226                               DATA_OUT_URB_INFLIGHT |
 227                               COMMAND_ABORTED))
 228                 return -EBUSY;
 229         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 230         uas_free_unsubmitted_urbs(cmnd);
 231         cmnd->scsi_done(cmnd);
 232         return 0;
 233 }
 234
 235 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 236                           unsigned direction)
 237 {
 238         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 239         int err;
 240
 241         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 242         err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 243         if (err) {
 244                 uas_add_work(cmdinfo);
 245         }
 246 }
 247
 248 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
 249 {
 250         u8 response_code = riu->response_code;
 251
 252         switch (response_code) {
 253         case RC_INCORRECT_LUN:
 254                 cmnd->result = DID_BAD_TARGET << 16;
 255                 break;
 256         case RC_TMF_SUCCEEDED:
 257                 cmnd->result = DID_OK << 16;
 258                 break;
 259         case RC_TMF_NOT_SUPPORTED:
 260                 cmnd->result = DID_TARGET_FAILURE << 16;
 261                 break;
 262         default:
 263                 uas_log_cmd_state(cmnd, "response iu", response_code);
 264                 cmnd->result = DID_ERROR << 16;
 265                 break;
 266         }
 267
 268         return response_code == RC_TMF_SUCCEEDED;
 269 }
 270
 271 static void uas_stat_cmplt(struct urb *urb)
 272 {
 273         struct iu *iu = urb->transfer_buffer;
 274         struct Scsi_Host *shost = urb->context;
 275         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 276         struct urb *data_in_urb = NULL;
 277         struct urb *data_out_urb = NULL;
 278         struct scsi_cmnd *cmnd;
 279         struct uas_cmd_info *cmdinfo;
 280         unsigned long flags;
 281         unsigned int idx;
 282         int status = urb->status;
 283         bool success;
 284
 285         spin_lock_irqsave(&devinfo->lock, flags);
 286
 287         if (devinfo->resetting)
 288                 goto out;
 289
 290         if (status) {
 291                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 292                         dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
 293                 goto out;
 294         }
 295
 296         idx = be16_to_cpup(&iu->tag) - 1;
 297         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 298                 dev_err(&urb->dev->dev,
 299                         "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
 300                 goto out;
 301         }
 302
 303         cmnd = devinfo->cmnd[idx];
 304         cmdinfo = (void *)&cmnd->SCp;
 305
 306         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
 307                 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
 308                 goto out;
 309         }
 310
 311         switch (iu->iu_id) {
 312         case IU_ID_STATUS:
 313                 uas_sense(urb, cmnd);
 314                 if (cmnd->result != 0) {
 315                         /* cancel data transfers on error */
 316                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 317                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 318                 }
 319                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 320                 uas_try_complete(cmnd, __func__);
 321                 break;
 322         case IU_ID_READ_READY:
 323                 if (!cmdinfo->data_in_urb ||
 324                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 325                         uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
 326                         break;
 327                 }
 328                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 329                 break;
 330         case IU_ID_WRITE_READY:
 331                 if (!cmdinfo->data_out_urb ||
 332                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 333                         uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
 334                         break;
 335                 }
 336                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 337                 break;
 338         case IU_ID_RESPONSE:
 339                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 340                 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
 341                 if (!success) {
 342                         /* Error, cancel data transfers */
 343                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 344                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 345                 }
 346                 uas_try_complete(cmnd, __func__);
 347                 break;
 348         default:
 349                 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
 350         }
 351 out:
 352         usb_free_urb(urb);
 353         spin_unlock_irqrestore(&devinfo->lock, flags);
 354
 355         /* Unlinking of data urbs must be done without holding the lock */
 356         if (data_in_urb) {
 357                 usb_unlink_urb(data_in_urb);
 358                 usb_put_urb(data_in_urb);
 359         }
 360         if (data_out_urb) {
 361                 usb_unlink_urb(data_out_urb);
 362                 usb_put_urb(data_out_urb);
 363         }
 364 }
 365
 366 static void uas_data_cmplt(struct urb *urb)
 367 {
 368         struct scsi_cmnd *cmnd = urb->context;
 369         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 370         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 371         struct scsi_data_buffer *sdb = NULL;
 372         unsigned long flags;
 373         int status = urb->status;
 374
 375         spin_lock_irqsave(&devinfo->lock, flags);
 376
 377         if (cmdinfo->data_in_urb == urb) {
 378                 sdb = scsi_in(cmnd);
 379                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 380                 cmdinfo->data_in_urb = NULL;
 381         } else if (cmdinfo->data_out_urb == urb) {
 382                 sdb = scsi_out(cmnd);
 383                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 384                 cmdinfo->data_out_urb = NULL;
 385         }
 386         if (sdb == NULL) {
 387                 WARN_ON_ONCE(1);
 388                 goto out;
 389         }
 390
 391         if (devinfo->resetting)
 392                 goto out;
 393
 394         /* Data urbs should not complete before the cmd urb is submitted */
 395         if (cmdinfo->state & SUBMIT_CMD_URB) {
 396                 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
 397                 goto out;
 398         }
 399
 400         if (status) {
 401                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 402                         uas_log_cmd_state(cmnd, "data cmplt err", status);
 403                 /* error: no data transfered */
 404                 sdb->resid = sdb->length;
 405         } else {
 406                 sdb->resid = sdb->length - urb->actual_length;
 407         }
 408         uas_try_complete(cmnd, __func__);
 409 out:
 410         usb_free_urb(urb);
 411         spin_unlock_irqrestore(&devinfo->lock, flags);
 412 }
 413
 414 static void uas_cmd_cmplt(struct urb *urb)
 415 {
 416         if (urb->status)
 417                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
 418
 419         usb_free_urb(urb);
 420 }
 421
 422 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 423                                       struct scsi_cmnd *cmnd,
 424                                       enum dma_data_direction dir)
 425 {
 426         struct usb_device *udev = devinfo->udev;
 427         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 428         struct urb *urb = usb_alloc_urb(0, gfp);
 429         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 430                 ? scsi_in(cmnd) : scsi_out(cmnd);
 431         unsigned int pipe = (dir == DMA_FROM_DEVICE)
 432                 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
 433
 434         if (!urb)
 435                 goto out;
 436         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 437                           uas_data_cmplt, cmnd);
 438         if (devinfo->use_streams)
 439                 urb->stream_id = cmdinfo->uas_tag;
 440         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 441         urb->sg = sdb->table.sgl;
 442  out:
 443         return urb;
 444 }
 445
 446 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 447                                        struct scsi_cmnd *cmnd)
 448 {
 449         struct usb_device *udev = devinfo->udev;
 450         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 451         struct urb *urb = usb_alloc_urb(0, gfp);
 452         struct sense_iu *iu;
 453
 454         if (!urb)
 455                 goto out;
 456
 457         iu = kzalloc(sizeof(*iu), gfp);
 458         if (!iu)
 459                 goto free;
 460
 461         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 462                           uas_stat_cmplt, cmnd->device->host);
 463         if (devinfo->use_streams)
 464                 urb->stream_id = cmdinfo->uas_tag;
 465         urb->transfer_flags |= URB_FREE_BUFFER;
 466  out:
 467         return urb;
 468  free:
 469         usb_free_urb(urb);
 470         return NULL;
 471 }
 472
 473 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 474                                         struct scsi_cmnd *cmnd)
 475 {
 476         struct usb_device *udev = devinfo->udev;
 477         struct scsi_device *sdev = cmnd->device;
 478         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 479         struct urb *urb = usb_alloc_urb(0, gfp);
 480         struct command_iu *iu;
 481         int len;
 482
 483         if (!urb)
 484                 goto out;
 485
 486         len = cmnd->cmd_len - 16;
 487         if (len < 0)
 488                 len = 0;
 489         len = ALIGN(len, 4);
 490         iu = kzalloc(sizeof(*iu) + len, gfp);
 491         if (!iu)
 492                 goto free;
 493
 494         iu->iu_id = IU_ID_COMMAND;
 495         iu->tag = cpu_to_be16(cmdinfo->uas_tag);
 496         iu->prio_attr = UAS_SIMPLE_TAG;
 497         iu->len = len;
 498         int_to_scsilun(sdev->lun, &iu->lun);
 499         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 500
 501         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 502                                                         uas_cmd_cmplt, NULL);
 503         urb->transfer_flags |= URB_FREE_BUFFER;
 504  out:
 505         return urb;
 506  free:
 507         usb_free_urb(urb);
 508         return NULL;
 509 }
 510
 511 /*
 512  * Why should I request the Status IU before sending the Command IU?  Spec
 513  * says to, but also says the device may receive them in any order.  Seems
 514  * daft to me.
 515  */
 516
 517 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
 518 {
 519         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 520         struct urb *urb;
 521         int err;
 522
 523         urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
 524         if (!urb)
 525                 return NULL;
 526         usb_anchor_urb(urb, &devinfo->sense_urbs);
 527         err = usb_submit_urb(urb, gfp);
 528         if (err) {
 529                 usb_unanchor_urb(urb);
 530                 uas_log_cmd_state(cmnd, "sense submit err", err);
 531                 usb_free_urb(urb);
 532                 return NULL;
 533         }
 534         return urb;
 535 }
 536
 537 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 538                            struct uas_dev_info *devinfo)
 539 {
 540         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 541         struct urb *urb;
 542         int err;
 543
 544         lockdep_assert_held(&devinfo->lock);
 545         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 546                 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
 547                 if (!urb)
 548                         return SCSI_MLQUEUE_DEVICE_BUSY;
 549                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 550         }
 551
 552         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 553                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 554                                                         cmnd, DMA_FROM_DEVICE);
 555                 if (!cmdinfo->data_in_urb)
 556                         return SCSI_MLQUEUE_DEVICE_BUSY;
 557                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 558         }
 559
 560         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 561                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 562                 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
 563                 if (err) {
 564                         usb_unanchor_urb(cmdinfo->data_in_urb);
 565                         uas_log_cmd_state(cmnd, "data in submit err", err);
 566                         return SCSI_MLQUEUE_DEVICE_BUSY;
 567                 }
 568                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 569                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 570         }
 571
 572         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 573                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 574                                                         cmnd, DMA_TO_DEVICE);
 575                 if (!cmdinfo->data_out_urb)
 576                         return SCSI_MLQUEUE_DEVICE_BUSY;
 577                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 578         }
 579
 580         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 581                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 582                 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
 583                 if (err) {
 584                         usb_unanchor_urb(cmdinfo->data_out_urb);
 585                         uas_log_cmd_state(cmnd, "data out submit err", err);
 586                         return SCSI_MLQUEUE_DEVICE_BUSY;
 587                 }
 588                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 589                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 590         }
 591
 592         if (cmdinfo->state & ALLOC_CMD_URB) {
 593                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
 594                 if (!cmdinfo->cmd_urb)
 595                         return SCSI_MLQUEUE_DEVICE_BUSY;
 596                 cmdinfo->state &= ~ALLOC_CMD_URB;
 597         }
 598
 599         if (cmdinfo->state & SUBMIT_CMD_URB) {
 600                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 601                 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
 602                 if (err) {
 603                         usb_unanchor_urb(cmdinfo->cmd_urb);
 604                         uas_log_cmd_state(cmnd, "cmd submit err", err);
 605                         return SCSI_MLQUEUE_DEVICE_BUSY;
 606                 }
 607                 cmdinfo->cmd_urb = NULL;
 608                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 609                 cmdinfo->state |= COMMAND_INFLIGHT;
 610         }
 611
 612         return 0;
 613 }
 614
 615 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 616                                         void (*done)(struct scsi_cmnd *))
 617 {
 618         struct scsi_device *sdev = cmnd->device;
 619         struct uas_dev_info *devinfo = sdev->hostdata;
 620         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 621         unsigned long flags;
 622         int idx, err;
 623
 624         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 625
 626         /* Re-check scsi_block_requests now that we've the host-lock */
 627         if (cmnd->device->host->host_self_blocked)
 628                 return SCSI_MLQUEUE_DEVICE_BUSY;
 629
 630         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 631                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 632                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 633                        sizeof(usb_stor_sense_invalidCDB));
 634                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 635                 cmnd->scsi_done(cmnd);
 636                 return 0;
 637         }
 638
 639         spin_lock_irqsave(&devinfo->lock, flags);
 640
 641         if (devinfo->resetting) {
 642                 cmnd->result = DID_ERROR << 16;
 643                 cmnd->scsi_done(cmnd);
 644                 spin_unlock_irqrestore(&devinfo->lock, flags);
 645                 return 0;
 646         }
 647
 648         /* Find a free uas-tag */
 649         for (idx = 0; idx < devinfo->qdepth; idx++) {
 650                 if (!devinfo->cmnd[idx])
 651                         break;
 652         }
 653         if (idx == devinfo->qdepth) {
 654                 spin_unlock_irqrestore(&devinfo->lock, flags);
 655                 return SCSI_MLQUEUE_DEVICE_BUSY;
 656         }
 657
 658         cmnd->scsi_done = done;
 659
 660         memset(cmdinfo, 0, sizeof(*cmdinfo));
 661         cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
 662         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 663
 664         switch (cmnd->sc_data_direction) {
 665         case DMA_FROM_DEVICE:
 666                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 667                 break;
 668         case DMA_BIDIRECTIONAL:
 669                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 670                 /* fall through */
 671         case DMA_TO_DEVICE:
 672                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 673         case DMA_NONE:
 674                 break;
 675         }
 676
 677         if (!devinfo->use_streams)
 678                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 679
 680         err = uas_submit_urbs(cmnd, devinfo);
 681         if (err) {
 682                 /* If we did nothing, give up now */
 683                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 684                         spin_unlock_irqrestore(&devinfo->lock, flags);
 685                         return SCSI_MLQUEUE_DEVICE_BUSY;
 686                 }
 687                 uas_add_work(cmdinfo);
 688         }
 689
 690         devinfo->cmnd[idx] = cmnd;
 691         spin_unlock_irqrestore(&devinfo->lock, flags);
 692         return 0;
 693 }
 694
 695 static DEF_SCSI_QCMD(uas_queuecommand)
 696
 697 /*
 698  * For now we do not support actually sending an abort to the device, so
 699  * this eh always fails. Still we must define it to make sure that we've
 700  * dropped all references to the cmnd in question once this function exits.
 701  */
 702 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 703 {
 704         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 705         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 706         struct urb *data_in_urb = NULL;
 707         struct urb *data_out_urb = NULL;
 708         unsigned long flags;
 709
 710         spin_lock_irqsave(&devinfo->lock, flags);
 711
 712         uas_log_cmd_state(cmnd, __func__, 0);
 713
 714         /* Ensure that try_complete does not call scsi_done */
 715         cmdinfo->state |= COMMAND_ABORTED;
 716
 717         /* Drop all refs to this cmnd, kill data urbs to break their ref */
 718         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 719         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 720                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 721         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 722                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 723
 724         uas_free_unsubmitted_urbs(cmnd);
 725
 726         spin_unlock_irqrestore(&devinfo->lock, flags);
 727
 728         if (data_in_urb) {
 729                 usb_kill_urb(data_in_urb);
 730                 usb_put_urb(data_in_urb);
 731         }
 732         if (data_out_urb) {
 733                 usb_kill_urb(data_out_urb);
 734                 usb_put_urb(data_out_urb);
 735         }
 736
 737         return FAILED;
 738 }
 739
 740 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
 741 {
 742         struct scsi_device *sdev = cmnd->device;
 743         struct uas_dev_info *devinfo = sdev->hostdata;
 744         struct usb_device *udev = devinfo->udev;
 745         unsigned long flags;
 746         int err;
 747
 748         err = usb_lock_device_for_reset(udev, devinfo->intf);
 749         if (err) {
 750                 shost_printk(KERN_ERR, sdev->host,
 751                              "%s FAILED to get lock err %d\n", __func__, err);
 752                 return FAILED;
 753         }
 754
 755         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 756
 757         spin_lock_irqsave(&devinfo->lock, flags);
 758         devinfo->resetting = 1;
 759         spin_unlock_irqrestore(&devinfo->lock, flags);
 760
 761         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 762         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 763         usb_kill_anchored_urbs(&devinfo->data_urbs);
 764         uas_zap_pending(devinfo, DID_RESET);
 765
 766         err = usb_reset_device(udev);
 767
 768         spin_lock_irqsave(&devinfo->lock, flags);
 769         devinfo->resetting = 0;
 770         spin_unlock_irqrestore(&devinfo->lock, flags);
 771
 772         usb_unlock_device(udev);
 773
 774         if (err) {
 775                 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
 776                              __func__, err);
 777                 return FAILED;
 778         }
 779
 780         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 781         return SUCCESS;
 782 }
 783
 784 static int uas_target_alloc(struct scsi_target *starget)
 785 {
 786         struct uas_dev_info *devinfo = (struct uas_dev_info *)
 787                         dev_to_shost(starget->dev.parent)->hostdata;
 788
 789         if (devinfo->flags & US_FL_NO_REPORT_LUNS)
 790                 starget->no_report_luns = 1;
 791
 792         return 0;
 793 }
 794
 795 static int uas_slave_alloc(struct scsi_device *sdev)
 796 {
 797         struct uas_dev_info *devinfo =
 798                 (struct uas_dev_info *)sdev->host->hostdata;
 799
 800         sdev->hostdata = devinfo;
 801
 802         /*
 803          * USB has unusual DMA-alignment requirements: Although the
 804          * starting address of each scatter-gather element doesn't matter,
 805          * the length of each element except the last must be divisible
 806          * by the Bulk maxpacket value.  There's currently no way to
 807          * express this by block-layer constraints, so we'll cop out
 808          * and simply require addresses to be aligned at 512-byte
 809          * boundaries.  This is okay since most block I/O involves
 810          * hardware sectors that are multiples of 512 bytes in length,
 811          * and since host controllers up through USB 2.0 have maxpacket
 812          * values no larger than 512.
 813          *
 814          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
 815          * values can be as large as 2048.  To make that work properly
 816          * will require changes to the block layer.
 817          */
 818         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 819
 820         if (devinfo->flags & US_FL_MAX_SECTORS_64)
 821                 blk_queue_max_hw_sectors(sdev->request_queue, 64);
 822         else if (devinfo->flags & US_FL_MAX_SECTORS_240)
 823                 blk_queue_max_hw_sectors(sdev->request_queue, 240);
 824
 825         return 0;
 826 }
 827
 828 static int uas_slave_configure(struct scsi_device *sdev)
 829 {
 830         struct uas_dev_info *devinfo = sdev->hostdata;
 831
 832         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 833                 sdev->no_report_opcodes = 1;
 834
 835         /* A few buggy USB-ATA bridges don't understand FUA */
 836         if (devinfo->flags & US_FL_BROKEN_FUA)
 837                 sdev->broken_fua = 1;
 838
 839         /* UAS also needs to support FL_ALWAYS_SYNC */
 840         if (devinfo->flags & US_FL_ALWAYS_SYNC) {
 841                 sdev->skip_ms_page_3f = 1;
 842                 sdev->skip_ms_page_8 = 1;
 843                 sdev->wce_default_on = 1;
 844         }
 845
 846         /*
 847          * Some disks return the total number of blocks in response
 848          * to READ CAPACITY rather than the highest block number.
 849          * If this device makes that mistake, tell the sd driver.
 850          */
 851         if (devinfo->flags & US_FL_FIX_CAPACITY)
 852                 sdev->fix_capacity = 1;
 853
 854         /*
 855          * Some devices don't like MODE SENSE with page=0x3f,
 856          * which is the command used for checking if a device
 857          * is write-protected.  Now that we tell the sd driver
 858          * to do a 192-byte transfer with this command the
 859          * majority of devices work fine, but a few still can't
 860          * handle it.  The sd driver will simply assume those
 861          * devices are write-enabled.
 862          */
 863         if (devinfo->flags & US_FL_NO_WP_DETECT)
 864                 sdev->skip_ms_page_3f = 1;
 865
 866         scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
 867         return 0;
 868 }
 869
 870 static struct scsi_host_template uas_host_template = {
 871         .module = THIS_MODULE,
 872         .name = "uas",
 873         .queuecommand = uas_queuecommand,
 874         .target_alloc = uas_target_alloc,
 875         .slave_alloc = uas_slave_alloc,
 876         .slave_configure = uas_slave_configure,
 877         .eh_abort_handler = uas_eh_abort_handler,
 878         .eh_device_reset_handler = uas_eh_device_reset_handler,
 879         .this_id = -1,
 880         .sg_tablesize = SG_NONE,
 881         .skip_settle_delay = 1,
 882 };
 883
 884 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 885                     vendorName, productName, useProtocol, useTransport, \
 886                     initFunction, flags) \
 887 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 888         .driver_info = (flags) }
 889
 890 static struct usb_device_id uas_usb_ids[] = {
 891 #       include "unusual_uas.h"
 892         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 893         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 894         { }
 895 };
 896 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 897
 898 #undef UNUSUAL_DEV
 899
 900 static int uas_switch_interface(struct usb_device *udev,
 901                                 struct usb_interface *intf)
 902 {
 903         struct usb_host_interface *alt;
 904
 905         alt = uas_find_uas_alt_setting(intf);
 906         if (!alt)
 907                 return -ENODEV;
 908
 909         return usb_set_interface(udev, alt->desc.bInterfaceNumber,
 910                         alt->desc.bAlternateSetting);
 911 }
 912
 913 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 914 {
 915         struct usb_host_endpoint *eps[4] = { };
 916         struct usb_device *udev = devinfo->udev;
 917         int r;
 918
 919         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 920         if (r)
 921                 return r;
 922
 923         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 924                                             usb_endpoint_num(&eps[0]->desc));
 925         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 926                                             usb_endpoint_num(&eps[1]->desc));
 927         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 928                                             usb_endpoint_num(&eps[2]->desc));
 929         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 930                                             usb_endpoint_num(&eps[3]->desc));
 931
 932         if (udev->speed < USB_SPEED_SUPER) {
 933                 devinfo->qdepth = 32;
 934                 devinfo->use_streams = 0;
 935         } else {
 936                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 937                                                     3, MAX_CMNDS, GFP_NOIO);
 938                 if (devinfo->qdepth < 0)
 939                         return devinfo->qdepth;
 940                 devinfo->use_streams = 1;
 941         }
 942
 943         return 0;
 944 }
 945
 946 static void uas_free_streams(struct uas_dev_info *devinfo)
 947 {
 948         struct usb_device *udev = devinfo->udev;
 949         struct usb_host_endpoint *eps[3];
 950
 951         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 952         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 953         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 954         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 955 }
 956
 957 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 958 {
 959         int result = -ENOMEM;
 960         struct Scsi_Host *shost = NULL;
 961         struct uas_dev_info *devinfo;
 962         struct usb_device *udev = interface_to_usbdev(intf);
 963         unsigned long dev_flags;
 964
 965         if (!uas_use_uas_driver(intf, id, &dev_flags))
 966                 return -ENODEV;
 967
 968         if (uas_switch_interface(udev, intf))
 969                 return -ENODEV;
 970
 971         shost = scsi_host_alloc(&uas_host_template,
 972                                 sizeof(struct uas_dev_info));
 973         if (!shost)
 974                 goto set_alt0;
 975
 976         shost->max_cmd_len = 16 + 252;
 977         shost->max_id = 1;
 978         shost->max_lun = 256;
 979         shost->max_channel = 0;
 980         shost->sg_tablesize = udev->bus->sg_tablesize;
 981
 982         devinfo = (struct uas_dev_info *)shost->hostdata;
 983         devinfo->intf = intf;
 984         devinfo->udev = udev;
 985         devinfo->resetting = 0;
 986         devinfo->shutdown = 0;
 987         devinfo->flags = dev_flags;
 988         init_usb_anchor(&devinfo->cmd_urbs);
 989         init_usb_anchor(&devinfo->sense_urbs);
 990         init_usb_anchor(&devinfo->data_urbs);
 991         spin_lock_init(&devinfo->lock);
 992         INIT_WORK(&devinfo->work, uas_do_work);
 993
 994         result = uas_configure_endpoints(devinfo);
 995         if (result)
 996                 goto set_alt0;
 997
 998         /*
 999          * 1 tag is reserved for untagged commands +
1000          * 1 tag to avoid off by one errors in some bridge firmwares
1001          */
1002         shost->can_queue = devinfo->qdepth - 2;
1003
1004         usb_set_intfdata(intf, shost);
1005         result = scsi_add_host(shost, &intf->dev);
1006         if (result)
1007                 goto free_streams;
1008
1009         scsi_scan_host(shost);
1010         return result;
1011
1012 free_streams:
1013         uas_free_streams(devinfo);
1014         usb_set_intfdata(intf, NULL);
1015 set_alt0:
1016         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1017         if (shost)
1018                 scsi_host_put(shost);
1019         return result;
1020 }
1021
1022 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1023 {
1024         unsigned long flags;
1025         int i, r = 1;
1026
1027         spin_lock_irqsave(&devinfo->lock, flags);
1028
1029         for (i = 0; i < devinfo->qdepth; i++) {
1030                 if (devinfo->cmnd[i]) {
1031                         r = 0; /* Not empty */
1032                         break;
1033                 }
1034         }
1035
1036         spin_unlock_irqrestore(&devinfo->lock, flags);
1037
1038         return r;
1039 }
1040
1041 /*
1042  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1043  * get empty while there still is more work to do due to sense-urbs completing
1044  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1045  */
1046 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1047 {
1048         unsigned long start_time;
1049         int r;
1050
1051         start_time = jiffies;
1052         do {
1053                 flush_work(&devinfo->work);
1054
1055                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1056                 if (r == 0)
1057                         return -ETIME;
1058
1059                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1060                 if (r == 0)
1061                         return -ETIME;
1062
1063                 if (time_after(jiffies, start_time + 5 * HZ))
1064                         return -ETIME;
1065         } while (!uas_cmnd_list_empty(devinfo));
1066
1067         return 0;
1068 }
1069
1070 static int uas_pre_reset(struct usb_interface *intf)
1071 {
1072         struct Scsi_Host *shost = usb_get_intfdata(intf);
1073         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1074         unsigned long flags;
1075
1076         if (devinfo->shutdown)
1077                 return 0;
1078
1079         /* Block new requests */
1080         spin_lock_irqsave(shost->host_lock, flags);
1081         scsi_block_requests(shost);
1082         spin_unlock_irqrestore(shost->host_lock, flags);
1083
1084         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1085                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1086                 scsi_unblock_requests(shost);
1087                 return 1;
1088         }
1089
1090         uas_free_streams(devinfo);
1091
1092         return 0;
1093 }
1094
1095 static int uas_post_reset(struct usb_interface *intf)
1096 {
1097         struct Scsi_Host *shost = usb_get_intfdata(intf);
1098         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1099         unsigned long flags;
1100         int err;
1101
1102         if (devinfo->shutdown)
1103                 return 0;
1104
1105         err = uas_configure_endpoints(devinfo);
1106         if (err && err != -ENODEV)
1107                 shost_printk(KERN_ERR, shost,
1108                              "%s: alloc streams error %d after reset",
1109                              __func__, err);
1110
1111         /* we must unblock the host in every case lest we deadlock */
1112         spin_lock_irqsave(shost->host_lock, flags);
1113         scsi_report_bus_reset(shost, 0);
1114         spin_unlock_irqrestore(shost->host_lock, flags);
1115
1116         scsi_unblock_requests(shost);
1117
1118         return err ? 1 : 0;
1119 }
1120
1121 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1122 {
1123         struct Scsi_Host *shost = usb_get_intfdata(intf);
1124         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1125
1126         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1127                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1128                 return -ETIME;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static int uas_resume(struct usb_interface *intf)
1135 {
1136         return 0;
1137 }
1138
1139 static int uas_reset_resume(struct usb_interface *intf)
1140 {
1141         struct Scsi_Host *shost = usb_get_intfdata(intf);
1142         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1143         unsigned long flags;
1144         int err;
1145
1146         err = uas_configure_endpoints(devinfo);
1147         if (err) {
1148                 shost_printk(KERN_ERR, shost,
1149                              "%s: alloc streams error %d after reset",
1150                              __func__, err);
1151                 return -EIO;
1152         }
1153
1154         spin_lock_irqsave(shost->host_lock, flags);
1155         scsi_report_bus_reset(shost, 0);
1156         spin_unlock_irqrestore(shost->host_lock, flags);
1157
1158         return 0;
1159 }
1160
1161 static void uas_disconnect(struct usb_interface *intf)
1162 {
1163         struct Scsi_Host *shost = usb_get_intfdata(intf);
1164         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1165         unsigned long flags;
1166
1167         spin_lock_irqsave(&devinfo->lock, flags);
1168         devinfo->resetting = 1;
1169         spin_unlock_irqrestore(&devinfo->lock, flags);
1170
1171         cancel_work_sync(&devinfo->work);
1172         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1173         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1174         usb_kill_anchored_urbs(&devinfo->data_urbs);
1175         uas_zap_pending(devinfo, DID_NO_CONNECT);
1176
1177         scsi_remove_host(shost);
1178         uas_free_streams(devinfo);
1179         scsi_host_put(shost);
1180 }
1181
1182 /*
1183  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1184  * hang on reboot when the device is still in uas mode. Note the reset is
1185  * necessary as some devices won't revert to usb-storage mode without it.
1186  */
1187 static void uas_shutdown(struct device *dev)
1188 {
1189         struct usb_interface *intf = to_usb_interface(dev);
1190         struct usb_device *udev = interface_to_usbdev(intf);
1191         struct Scsi_Host *shost = usb_get_intfdata(intf);
1192         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1193
1194         if (system_state != SYSTEM_RESTART)
1195                 return;
1196
1197         devinfo->shutdown = 1;
1198         uas_free_streams(devinfo);
1199         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1200         usb_reset_device(udev);
1201 }
1202
1203 static struct usb_driver uas_driver = {
1204         .name = "uas",
1205         .probe = uas_probe,
1206         .disconnect = uas_disconnect,
1207         .pre_reset = uas_pre_reset,
1208         .post_reset = uas_post_reset,
1209         .suspend = uas_suspend,
1210         .resume = uas_resume,
1211         .reset_resume = uas_reset_resume,
1212         .drvwrap.driver.shutdown = uas_shutdown,
1213         .id_table = uas_usb_ids,
1214 };
1215
1216 module_usb_driver(uas_driver);
1217
1218 MODULE_LICENSE("GPL");
1219 MODULE_AUTHOR(
1220         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");