2 * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
3 * Copyright (c) 2014 Intel Corporation. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include "iwpm_util.h"
36 #define IWPM_MAPINFO_HASH_SIZE 512
37 #define IWPM_MAPINFO_HASH_MASK (IWPM_MAPINFO_HASH_SIZE - 1)
38 #define IWPM_REMINFO_HASH_SIZE 64
39 #define IWPM_REMINFO_HASH_MASK (IWPM_REMINFO_HASH_SIZE - 1)
40 #define IWPM_MSG_SIZE 512
42 static LIST_HEAD(iwpm_nlmsg_req_list);
43 static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
45 static struct hlist_head *iwpm_hash_bucket;
46 static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
48 static struct hlist_head *iwpm_reminfo_bucket;
49 static DEFINE_SPINLOCK(iwpm_reminfo_lock);
51 static DEFINE_MUTEX(iwpm_admin_lock);
52 static struct iwpm_admin_data iwpm_admin;
54 int iwpm_init(u8 nl_client)
57 mutex_lock(&iwpm_admin_lock);
58 if (atomic_read(&iwpm_admin.refcount) == 0) {
59 iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
60 sizeof(struct hlist_head),
62 if (!iwpm_hash_bucket) {
66 iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
67 sizeof(struct hlist_head),
69 if (!iwpm_reminfo_bucket) {
70 kfree(iwpm_hash_bucket);
75 atomic_inc(&iwpm_admin.refcount);
77 mutex_unlock(&iwpm_admin_lock);
79 iwpm_set_valid(nl_client, 1);
80 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
81 pr_debug("%s: Mapinfo and reminfo tables are created\n",
87 static void free_hash_bucket(void);
88 static void free_reminfo_bucket(void);
90 int iwpm_exit(u8 nl_client)
93 if (!iwpm_valid_client(nl_client))
95 mutex_lock(&iwpm_admin_lock);
96 if (atomic_read(&iwpm_admin.refcount) == 0) {
97 mutex_unlock(&iwpm_admin_lock);
98 pr_err("%s Incorrect usage - negative refcount\n", __func__);
101 if (atomic_dec_and_test(&iwpm_admin.refcount)) {
103 free_reminfo_bucket();
104 pr_debug("%s: Resources are destroyed\n", __func__);
106 mutex_unlock(&iwpm_admin_lock);
107 iwpm_set_valid(nl_client, 0);
108 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
112 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
113 struct sockaddr_storage *);
115 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
116 struct sockaddr_storage *mapped_sockaddr,
119 struct hlist_head *hash_bucket_head = NULL;
120 struct iwpm_mapping_info *map_info;
124 if (!iwpm_valid_client(nl_client))
126 map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
130 memcpy(&map_info->local_sockaddr, local_sockaddr,
131 sizeof(struct sockaddr_storage));
132 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
133 sizeof(struct sockaddr_storage));
134 map_info->nl_client = nl_client;
136 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
137 if (iwpm_hash_bucket) {
138 hash_bucket_head = get_mapinfo_hash_bucket(
139 &map_info->local_sockaddr,
140 &map_info->mapped_sockaddr);
141 if (hash_bucket_head) {
142 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
146 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
148 if (!hash_bucket_head)
153 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
154 struct sockaddr_storage *mapped_local_addr)
156 struct hlist_node *tmp_hlist_node;
157 struct hlist_head *hash_bucket_head;
158 struct iwpm_mapping_info *map_info = NULL;
162 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
163 if (iwpm_hash_bucket) {
164 hash_bucket_head = get_mapinfo_hash_bucket(
167 if (!hash_bucket_head)
168 goto remove_mapinfo_exit;
170 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
171 hash_bucket_head, hlist_node) {
173 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
174 mapped_local_addr)) {
176 hlist_del_init(&map_info->hlist_node);
184 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
188 static void free_hash_bucket(void)
190 struct hlist_node *tmp_hlist_node;
191 struct iwpm_mapping_info *map_info;
195 /* remove all the mapinfo data from the list */
196 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
197 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
198 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
199 &iwpm_hash_bucket[i], hlist_node) {
201 hlist_del_init(&map_info->hlist_node);
205 /* free the hash list */
206 kfree(iwpm_hash_bucket);
207 iwpm_hash_bucket = NULL;
208 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
211 static void free_reminfo_bucket(void)
213 struct hlist_node *tmp_hlist_node;
214 struct iwpm_remote_info *rem_info;
218 /* remove all the remote info from the list */
219 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
220 for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
221 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
222 &iwpm_reminfo_bucket[i], hlist_node) {
224 hlist_del_init(&rem_info->hlist_node);
228 /* free the hash list */
229 kfree(iwpm_reminfo_bucket);
230 iwpm_reminfo_bucket = NULL;
231 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
234 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
235 struct sockaddr_storage *);
237 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
239 struct hlist_head *hash_bucket_head;
242 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
243 if (iwpm_reminfo_bucket) {
244 hash_bucket_head = get_reminfo_hash_bucket(
245 &rem_info->mapped_loc_sockaddr,
246 &rem_info->mapped_rem_sockaddr);
247 if (hash_bucket_head)
248 hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
250 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
253 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
254 struct sockaddr_storage *mapped_rem_addr,
255 struct sockaddr_storage *remote_addr,
258 struct hlist_node *tmp_hlist_node;
259 struct hlist_head *hash_bucket_head;
260 struct iwpm_remote_info *rem_info = NULL;
264 if (!iwpm_valid_client(nl_client)) {
265 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
268 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
269 if (iwpm_reminfo_bucket) {
270 hash_bucket_head = get_reminfo_hash_bucket(
273 if (!hash_bucket_head)
274 goto get_remote_info_exit;
275 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
276 hash_bucket_head, hlist_node) {
278 if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
280 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
283 memcpy(remote_addr, &rem_info->remote_sockaddr,
284 sizeof(struct sockaddr_storage));
285 iwpm_print_sockaddr(remote_addr,
286 "get_remote_info: Remote sockaddr:");
288 hlist_del_init(&rem_info->hlist_node);
295 get_remote_info_exit:
296 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
300 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
301 u8 nl_client, gfp_t gfp)
303 struct iwpm_nlmsg_request *nlmsg_request = NULL;
306 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
310 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
311 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
312 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
314 kref_init(&nlmsg_request->kref);
315 kref_get(&nlmsg_request->kref);
316 nlmsg_request->nlmsg_seq = nlmsg_seq;
317 nlmsg_request->nl_client = nl_client;
318 nlmsg_request->request_done = 0;
319 nlmsg_request->err_code = 0;
320 sema_init(&nlmsg_request->sem, 1);
321 down(&nlmsg_request->sem);
322 return nlmsg_request;
325 void iwpm_free_nlmsg_request(struct kref *kref)
327 struct iwpm_nlmsg_request *nlmsg_request;
330 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
332 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
333 list_del_init(&nlmsg_request->inprocess_list);
334 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
336 if (!nlmsg_request->request_done)
337 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
338 __func__, nlmsg_request->nlmsg_seq);
339 kfree(nlmsg_request);
342 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
344 struct iwpm_nlmsg_request *nlmsg_request;
345 struct iwpm_nlmsg_request *found_request = NULL;
348 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
349 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
351 if (nlmsg_request->nlmsg_seq == echo_seq) {
352 found_request = nlmsg_request;
353 kref_get(&nlmsg_request->kref);
357 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
358 return found_request;
361 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
365 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
368 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
369 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
371 ret = nlmsg_request->err_code;
373 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
377 int iwpm_get_nlmsg_seq(void)
379 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
382 int iwpm_valid_client(u8 nl_client)
384 return iwpm_admin.client_list[nl_client];
387 void iwpm_set_valid(u8 nl_client, int valid)
389 iwpm_admin.client_list[nl_client] = valid;
393 u32 iwpm_get_registration(u8 nl_client)
395 return iwpm_admin.reg_list[nl_client];
399 void iwpm_set_registration(u8 nl_client, u32 reg)
401 iwpm_admin.reg_list[nl_client] = reg;
405 u32 iwpm_check_registration(u8 nl_client, u32 reg)
407 return (iwpm_get_registration(nl_client) & reg);
410 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
411 struct sockaddr_storage *b_sockaddr)
413 if (a_sockaddr->ss_family != b_sockaddr->ss_family)
415 if (a_sockaddr->ss_family == AF_INET) {
416 struct sockaddr_in *a4_sockaddr =
417 (struct sockaddr_in *)a_sockaddr;
418 struct sockaddr_in *b4_sockaddr =
419 (struct sockaddr_in *)b_sockaddr;
420 if (!memcmp(&a4_sockaddr->sin_addr,
421 &b4_sockaddr->sin_addr, sizeof(struct in_addr))
422 && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
425 } else if (a_sockaddr->ss_family == AF_INET6) {
426 struct sockaddr_in6 *a6_sockaddr =
427 (struct sockaddr_in6 *)a_sockaddr;
428 struct sockaddr_in6 *b6_sockaddr =
429 (struct sockaddr_in6 *)b_sockaddr;
430 if (!memcmp(&a6_sockaddr->sin6_addr,
431 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
432 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
436 pr_err("%s: Invalid sockaddr family\n", __func__);
441 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
444 struct sk_buff *skb = NULL;
446 skb = dev_alloc_skb(IWPM_MSG_SIZE);
448 goto create_nlmsg_exit;
450 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
452 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
460 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
461 const struct nla_policy *nlmsg_policy,
462 struct nlattr *nltb[], const char *msg_type)
466 const char *err_str = "";
468 ret = nlmsg_validate(cb->nlh, nlh_len, policy_max - 1, nlmsg_policy,
471 err_str = "Invalid attribute";
472 goto parse_nlmsg_error;
474 ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max - 1,
477 err_str = "Unable to parse the nlmsg";
478 goto parse_nlmsg_error;
480 ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
482 err_str = "Invalid NULL attribute";
483 goto parse_nlmsg_error;
487 pr_warn("%s: %s (msg type %s ret = %d)\n",
488 __func__, err_str, msg_type, ret);
492 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
494 struct sockaddr_in6 *sockaddr_v6;
495 struct sockaddr_in *sockaddr_v4;
497 switch (sockaddr->ss_family) {
499 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
500 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
501 msg, &sockaddr_v4->sin_addr,
502 ntohs(sockaddr_v4->sin_port),
503 ntohs(sockaddr_v4->sin_port));
506 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
507 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
508 msg, &sockaddr_v6->sin6_addr,
509 ntohs(sockaddr_v6->sin6_port),
510 ntohs(sockaddr_v6->sin6_port));
517 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
519 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
520 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
524 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
526 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
527 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
531 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
532 struct sockaddr_storage *b_sockaddr, u32 *hash)
536 if (a_sockaddr->ss_family == AF_INET) {
537 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
538 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
540 } else if (a_sockaddr->ss_family == AF_INET6) {
541 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
542 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
544 pr_err("%s: Invalid sockaddr family\n", __func__);
548 if (a_hash == b_hash) /* if port mapper isn't available */
551 *hash = jhash_2words(a_hash, b_hash, 0);
555 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
556 *local_sockaddr, struct sockaddr_storage
562 ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
565 return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
568 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
569 *mapped_loc_sockaddr, struct sockaddr_storage
570 *mapped_rem_sockaddr)
575 ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
578 return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
581 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
583 struct sk_buff *skb = NULL;
584 struct nlmsghdr *nlh;
586 const char *err_str = "";
589 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
591 err_str = "Unable to create a nlmsg";
592 goto mapinfo_num_error;
594 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
596 err_str = "Unable to put attribute of mapinfo number nlmsg";
597 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
599 goto mapinfo_num_error;
600 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
601 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
603 goto mapinfo_num_error;
607 ret = rdma_nl_unicast(skb, iwpm_pid);
610 err_str = "Unable to send a nlmsg";
611 goto mapinfo_num_error;
613 pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
616 pr_info("%s: %s\n", __func__, err_str);
622 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
624 struct nlmsghdr *nlh = NULL;
629 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
630 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
631 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
635 nlh->nlmsg_type = NLMSG_DONE;
636 ret = rdma_nl_unicast(skb, iwpm_pid);
638 pr_warn("%s Unable to send a nlmsg\n", __func__);
642 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
644 struct iwpm_mapping_info *map_info;
645 struct sk_buff *skb = NULL;
646 struct nlmsghdr *nlh;
647 int skb_num = 0, mapping_num = 0;
648 int i = 0, nlmsg_bytes = 0;
650 const char *err_str = "";
653 skb = dev_alloc_skb(NLMSG_GOODSIZE);
656 err_str = "Unable to allocate skb";
657 goto send_mapping_info_exit;
660 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
662 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
663 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
665 if (map_info->nl_client != nl_client)
668 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
669 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
671 err_str = "Unable to put the nlmsg header";
672 goto send_mapping_info_unlock;
674 err_str = "Unable to put attribute of the nlmsg";
675 ret = ibnl_put_attr(skb, nlh,
676 sizeof(struct sockaddr_storage),
677 &map_info->local_sockaddr,
678 IWPM_NLA_MAPINFO_LOCAL_ADDR);
680 goto send_mapping_info_unlock;
682 ret = ibnl_put_attr(skb, nlh,
683 sizeof(struct sockaddr_storage),
684 &map_info->mapped_sockaddr,
685 IWPM_NLA_MAPINFO_MAPPED_ADDR);
687 goto send_mapping_info_unlock;
691 iwpm_print_sockaddr(&map_info->local_sockaddr,
692 "send_mapping_info: Local sockaddr:");
693 iwpm_print_sockaddr(&map_info->mapped_sockaddr,
694 "send_mapping_info: Mapped local sockaddr:");
696 nlmsg_bytes += nlh->nlmsg_len;
698 /* check if all mappings can fit in one skb */
699 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
700 /* and leave room for NLMSG_DONE */
703 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
706 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
709 err_str = "Unable to send map info";
710 goto send_mapping_info_exit;
712 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
714 err_str = "Insufficient skbs for map info";
715 goto send_mapping_info_exit;
717 skb = dev_alloc_skb(NLMSG_GOODSIZE);
720 err_str = "Unable to allocate skb";
721 goto send_mapping_info_exit;
723 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
727 send_mapping_info_unlock:
728 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
729 send_mapping_info_exit:
731 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
736 send_nlmsg_done(skb, nl_client, iwpm_pid);
737 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
740 int iwpm_mapinfo_available(void)
743 int full_bucket = 0, i = 0;
745 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
746 if (iwpm_hash_bucket) {
747 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
748 if (!hlist_empty(&iwpm_hash_bucket[i])) {
754 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);