2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_arp.h>
17 #include <linux/timer.h>
18 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include "ieee80211_i.h"
24 #include "debugfs_sta.h"
28 * DOC: STA information lifetime rules
30 * STA info structures (&struct sta_info) are managed in a hash table
31 * for faster lookup and a list for iteration. They are managed using
32 * RCU, i.e. access to the list and hash table is protected by RCU.
34 * Upon allocating a STA info structure with sta_info_alloc(), the caller owns
35 * that structure. It must then either destroy it using sta_info_destroy()
36 * (which is pretty useless) or insert it into the hash table using
37 * sta_info_insert() which demotes the reference from ownership to a regular
38 * RCU-protected reference; if the function is called without protection by an
39 * RCU critical section the reference is instantly invalidated. Note that the
40 * caller may not do much with the STA info before inserting it, in particular,
41 * it may not start any mesh peer link management or add encryption keys.
43 * When the insertion fails (sta_info_insert()) returns non-zero), the
44 * structure will have been freed by sta_info_insert()!
46 * Because there are debugfs entries for each station, and adding those
47 * must be able to sleep, it is also possible to "pin" a station entry,
48 * that means it can be removed from the hash table but not be freed.
49 * See the comment in __sta_info_unlink() for more information, this is
50 * an internal capability only.
52 * In order to remove a STA info structure, the caller needs to first
53 * unlink it (sta_info_unlink()) from the list and hash tables and
54 * then destroy it; sta_info_destroy() will wait for an RCU grace period
55 * to elapse before actually freeing it. Due to the pinning and the
56 * possibility of multiple callers trying to remove the same STA info at
57 * the same time, sta_info_unlink() can clear the STA info pointer it is
58 * passed to indicate that the STA info is owned by somebody else now.
60 * If sta_info_unlink() did not clear the pointer then the caller owns
61 * the STA info structure now and is responsible of destroying it with
62 * a call to sta_info_destroy().
64 * In all other cases, there is no concept of ownership on a STA entry,
65 * each structure is owned by the global hash table/list until it is
66 * removed. All users of the structure need to be RCU protected so that
67 * the structure won't be freed before they are done using it.
70 /* Caller must hold local->sta_lock */
71 static int sta_info_hash_del(struct ieee80211_local
*local
,
76 s
= local
->sta_hash
[STA_HASH(sta
->addr
)];
80 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->addr
)],
85 while (s
->hnext
&& s
->hnext
!= sta
)
88 rcu_assign_pointer(s
->hnext
, sta
->hnext
);
95 /* protected by RCU */
96 static struct sta_info
*__sta_info_find(struct ieee80211_local
*local
,
101 sta
= rcu_dereference(local
->sta_hash
[STA_HASH(addr
)]);
103 if (compare_ether_addr(sta
->addr
, addr
) == 0)
105 sta
= rcu_dereference(sta
->hnext
);
110 struct sta_info
*sta_info_get(struct ieee80211_local
*local
, u8
*addr
)
112 return __sta_info_find(local
, addr
);
114 EXPORT_SYMBOL(sta_info_get
);
116 struct sta_info
*sta_info_get_by_idx(struct ieee80211_local
*local
, int idx
,
117 struct net_device
*dev
)
119 struct sta_info
*sta
;
122 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
123 if (dev
&& dev
!= sta
->sdata
->dev
)
136 * __sta_info_free - internal STA free helper
138 * @sta: STA info to free
140 * This function must undo everything done by sta_info_alloc()
141 * that may happen before sta_info_insert().
143 static void __sta_info_free(struct ieee80211_local
*local
,
144 struct sta_info
*sta
)
146 DECLARE_MAC_BUF(mbuf
);
148 rate_control_free_sta(sta
->rate_ctrl
, sta
->rate_ctrl_priv
);
149 rate_control_put(sta
->rate_ctrl
);
151 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
152 printk(KERN_DEBUG
"%s: Destroyed STA %s\n",
153 wiphy_name(local
->hw
.wiphy
), print_mac(mbuf
, sta
->addr
));
154 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
159 void sta_info_destroy(struct sta_info
*sta
)
161 struct ieee80211_local
*local
;
172 rate_control_remove_sta_debugfs(sta
);
173 ieee80211_sta_debugfs_remove(sta
);
175 #ifdef CONFIG_MAC80211_MESH
176 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
177 mesh_plink_deactivate(sta
);
181 * We have only unlinked the key, and actually destroying it
182 * may mean it is removed from hardware which requires that
183 * the key->sta pointer is still valid, so flush the key todo
186 * ieee80211_key_todo() will synchronize_rcu() so after this
187 * nothing can reference this sta struct any more.
189 ieee80211_key_todo();
191 #ifdef CONFIG_MAC80211_MESH
192 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
193 del_timer_sync(&sta
->plink_timer
);
196 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
197 local
->total_ps_buffered
--;
198 dev_kfree_skb_any(skb
);
201 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
)
202 dev_kfree_skb_any(skb
);
204 for (i
= 0; i
< STA_TID_NUM
; i
++) {
205 spin_lock_bh(&sta
->lock
);
206 if (sta
->ampdu_mlme
.tid_rx
[i
])
207 del_timer_sync(&sta
->ampdu_mlme
.tid_rx
[i
]->session_timer
);
208 if (sta
->ampdu_mlme
.tid_tx
[i
])
209 del_timer_sync(&sta
->ampdu_mlme
.tid_tx
[i
]->addba_resp_timer
);
210 spin_unlock_bh(&sta
->lock
);
213 __sta_info_free(local
, sta
);
217 /* Caller must hold local->sta_lock */
218 static void sta_info_hash_add(struct ieee80211_local
*local
,
219 struct sta_info
*sta
)
221 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->addr
)];
222 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->addr
)], sta
);
225 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
228 struct ieee80211_local
*local
= sdata
->local
;
229 struct sta_info
*sta
;
231 DECLARE_MAC_BUF(mbuf
);
233 sta
= kzalloc(sizeof(*sta
), gfp
);
237 spin_lock_init(&sta
->lock
);
239 memcpy(sta
->addr
, addr
, ETH_ALEN
);
243 sta
->rate_ctrl
= rate_control_get(local
->rate_ctrl
);
244 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
246 if (!sta
->rate_ctrl_priv
) {
247 rate_control_put(sta
->rate_ctrl
);
252 for (i
= 0; i
< STA_TID_NUM
; i
++) {
253 /* timer_to_tid must be initialized with identity mapping to
254 * enable session_timer's data differentiation. refer to
255 * sta_rx_agg_session_timer_expired for useage */
256 sta
->timer_to_tid
[i
] = i
;
257 /* tid to tx queue: initialize according to HW (0 is valid) */
258 sta
->tid_to_tx_q
[i
] = ieee80211_num_queues(&local
->hw
);
260 sta
->ampdu_mlme
.tid_state_rx
[i
] = HT_AGG_STATE_IDLE
;
261 sta
->ampdu_mlme
.tid_rx
[i
] = NULL
;
263 sta
->ampdu_mlme
.tid_state_tx
[i
] = HT_AGG_STATE_IDLE
;
264 sta
->ampdu_mlme
.tid_tx
[i
] = NULL
;
265 sta
->ampdu_mlme
.addba_req_num
[i
] = 0;
267 skb_queue_head_init(&sta
->ps_tx_buf
);
268 skb_queue_head_init(&sta
->tx_filtered
);
270 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
271 printk(KERN_DEBUG
"%s: Allocated STA %s\n",
272 wiphy_name(local
->hw
.wiphy
), print_mac(mbuf
, sta
->addr
));
273 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
275 #ifdef CONFIG_MAC80211_MESH
276 sta
->plink_state
= PLINK_LISTEN
;
277 init_timer(&sta
->plink_timer
);
283 int sta_info_insert(struct sta_info
*sta
)
285 struct ieee80211_local
*local
= sta
->local
;
286 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
289 DECLARE_MAC_BUF(mac
);
292 * Can't be a WARN_ON because it can be triggered through a race:
293 * something inserts a STA (on one CPU) without holding the RTNL
294 * and another CPU turns off the net device.
296 if (unlikely(!netif_running(sdata
->dev
))) {
301 if (WARN_ON(compare_ether_addr(sta
->addr
, sdata
->dev
->dev_addr
) == 0 ||
302 is_multicast_ether_addr(sta
->addr
))) {
307 spin_lock_irqsave(&local
->sta_lock
, flags
);
308 /* check if STA exists already */
309 if (__sta_info_find(local
, sta
->addr
)) {
310 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
314 list_add(&sta
->list
, &local
->sta_list
);
316 sta_info_hash_add(local
, sta
);
319 if (local
->ops
->sta_notify
) {
320 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_VLAN
)
321 sdata
= sdata
->u
.vlan
.ap
;
323 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
324 STA_NOTIFY_ADD
, sta
->addr
);
327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
328 printk(KERN_DEBUG
"%s: Inserted STA %s\n",
329 wiphy_name(local
->hw
.wiphy
), print_mac(mac
, sta
->addr
));
330 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
332 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
334 #ifdef CONFIG_MAC80211_DEBUGFS
336 * Debugfs entry adding might sleep, so schedule process
337 * context task for adding entry for STAs that do not yet
339 * NOTE: due to auto-freeing semantics this may only be done
340 * if the insertion is successful!
342 schedule_work(&local
->sta_debugfs_add
);
345 if (ieee80211_vif_is_mesh(&sdata
->vif
))
346 mesh_accept_plinks_update(sdata
);
351 __sta_info_free(local
, sta
);
355 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
358 * This format has been mandated by the IEEE specifications,
359 * so this line may not be changed to use the __set_bit() format.
361 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
364 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
367 * This format has been mandated by the IEEE specifications,
368 * so this line may not be changed to use the __clear_bit() format.
370 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
373 static void __sta_info_set_tim_bit(struct ieee80211_if_ap
*bss
,
374 struct sta_info
*sta
)
377 __bss_tim_set(bss
, sta
->aid
);
378 if (sta
->local
->ops
->set_tim
) {
379 sta
->local
->tim_in_locked_section
= true;
380 sta
->local
->ops
->set_tim(local_to_hw(sta
->local
), sta
->aid
, 1);
381 sta
->local
->tim_in_locked_section
= false;
385 void sta_info_set_tim_bit(struct sta_info
*sta
)
389 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
390 __sta_info_set_tim_bit(sta
->sdata
->bss
, sta
);
391 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
394 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap
*bss
,
395 struct sta_info
*sta
)
398 __bss_tim_clear(bss
, sta
->aid
);
399 if (sta
->local
->ops
->set_tim
) {
400 sta
->local
->tim_in_locked_section
= true;
401 sta
->local
->ops
->set_tim(local_to_hw(sta
->local
), sta
->aid
, 0);
402 sta
->local
->tim_in_locked_section
= false;
406 void sta_info_clear_tim_bit(struct sta_info
*sta
)
410 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
411 __sta_info_clear_tim_bit(sta
->sdata
->bss
, sta
);
412 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
415 void __sta_info_unlink(struct sta_info
**sta
)
417 struct ieee80211_local
*local
= (*sta
)->local
;
418 struct ieee80211_sub_if_data
*sdata
= (*sta
)->sdata
;
419 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
420 DECLARE_MAC_BUF(mbuf
);
423 * pull caller's reference if we're already gone.
425 if (sta_info_hash_del(local
, *sta
)) {
431 ieee80211_key_free((*sta
)->key
);
432 WARN_ON((*sta
)->key
);
435 list_del(&(*sta
)->list
);
437 if (test_and_clear_sta_flags(*sta
, WLAN_STA_PS
)) {
439 atomic_dec(&sdata
->bss
->num_sta_ps
);
440 __sta_info_clear_tim_bit(sdata
->bss
, *sta
);
445 if (local
->ops
->sta_notify
) {
446 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_VLAN
)
447 sdata
= sdata
->u
.vlan
.ap
;
449 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
450 STA_NOTIFY_REMOVE
, (*sta
)->addr
);
453 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
454 mesh_accept_plinks_update(sdata
);
455 #ifdef CONFIG_MAC80211_MESH
456 del_timer(&(*sta
)->plink_timer
);
460 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
461 printk(KERN_DEBUG
"%s: Removed STA %s\n",
462 wiphy_name(local
->hw
.wiphy
), print_mac(mbuf
, (*sta
)->addr
));
463 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
466 * Finally, pull caller's reference if the STA is pinned by the
467 * task that is adding the debugfs entries. In that case, we
468 * leave the STA "to be freed".
470 * The rules are not trivial, but not too complex either:
471 * (1) pin_status is only modified under the sta_lock
472 * (2) STAs may only be pinned under the RTNL so that
473 * sta_info_flush() is guaranteed to actually destroy
474 * all STAs that are active for a given interface, this
475 * is required for correctness because otherwise we
476 * could notify a driver that an interface is going
477 * away and only after that (!) notify it about a STA
478 * on that interface going away.
479 * (3) sta_info_debugfs_add_work() will set the status
480 * to PINNED when it found an item that needs a new
481 * debugfs directory created. In that case, that item
482 * must not be freed although all *RCU* users are done
483 * with it. Hence, we tell the caller of _unlink()
484 * that the item is already gone (as can happen when
485 * two tasks try to unlink/destroy at the same time)
486 * (4) We set the pin_status to DESTROY here when we
488 * (5) sta_info_debugfs_add_work() will reset the pin_status
489 * from PINNED to NORMAL when it is done with the item,
490 * but will check for DESTROY before resetting it in
491 * which case it will free the item.
493 if ((*sta
)->pin_status
== STA_INFO_PIN_STAT_PINNED
) {
494 (*sta
)->pin_status
= STA_INFO_PIN_STAT_DESTROY
;
500 void sta_info_unlink(struct sta_info
**sta
)
502 struct ieee80211_local
*local
= (*sta
)->local
;
505 spin_lock_irqsave(&local
->sta_lock
, flags
);
506 __sta_info_unlink(sta
);
507 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
510 static inline int sta_info_buffer_expired(struct ieee80211_local
*local
,
511 struct sta_info
*sta
,
514 struct ieee80211_tx_info
*info
;
520 info
= IEEE80211_SKB_CB(skb
);
522 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
523 timeout
= (sta
->listen_interval
* local
->hw
.conf
.beacon_int
* 32 /
525 if (timeout
< STA_TX_BUFFER_EXPIRE
)
526 timeout
= STA_TX_BUFFER_EXPIRE
;
527 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
531 static void sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
532 struct sta_info
*sta
)
536 struct ieee80211_sub_if_data
*sdata
;
537 DECLARE_MAC_BUF(mac
);
539 if (skb_queue_empty(&sta
->ps_tx_buf
))
543 spin_lock_irqsave(&sta
->ps_tx_buf
.lock
, flags
);
544 skb
= skb_peek(&sta
->ps_tx_buf
);
545 if (sta_info_buffer_expired(local
, sta
, skb
))
546 skb
= __skb_dequeue(&sta
->ps_tx_buf
);
549 spin_unlock_irqrestore(&sta
->ps_tx_buf
.lock
, flags
);
555 local
->total_ps_buffered
--;
556 printk(KERN_DEBUG
"Buffered frame expired (STA "
557 "%s)\n", print_mac(mac
, sta
->addr
));
560 if (skb_queue_empty(&sta
->ps_tx_buf
))
561 sta_info_clear_tim_bit(sta
);
566 static void sta_info_cleanup(unsigned long data
)
568 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
569 struct sta_info
*sta
;
572 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
573 sta_info_cleanup_expire_buffered(local
, sta
);
576 local
->sta_cleanup
.expires
=
577 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
);
578 add_timer(&local
->sta_cleanup
);
581 #ifdef CONFIG_MAC80211_DEBUGFS
583 * See comment in __sta_info_unlink,
584 * caller must hold local->sta_lock.
586 static void __sta_info_pin(struct sta_info
*sta
)
588 WARN_ON(sta
->pin_status
!= STA_INFO_PIN_STAT_NORMAL
);
589 sta
->pin_status
= STA_INFO_PIN_STAT_PINNED
;
593 * See comment in __sta_info_unlink, returns sta if it
594 * needs to be destroyed.
596 static struct sta_info
*__sta_info_unpin(struct sta_info
*sta
)
598 struct sta_info
*ret
= NULL
;
601 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
602 WARN_ON(sta
->pin_status
!= STA_INFO_PIN_STAT_DESTROY
&&
603 sta
->pin_status
!= STA_INFO_PIN_STAT_PINNED
);
604 if (sta
->pin_status
== STA_INFO_PIN_STAT_DESTROY
)
606 sta
->pin_status
= STA_INFO_PIN_STAT_NORMAL
;
607 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
612 static void sta_info_debugfs_add_work(struct work_struct
*work
)
614 struct ieee80211_local
*local
=
615 container_of(work
, struct ieee80211_local
, sta_debugfs_add
);
616 struct sta_info
*sta
, *tmp
;
619 /* We need to keep the RTNL across the whole pinned status. */
624 spin_lock_irqsave(&local
->sta_lock
, flags
);
625 list_for_each_entry(tmp
, &local
->sta_list
, list
) {
626 if (!tmp
->debugfs
.dir
) {
632 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
637 ieee80211_sta_debugfs_add(sta
);
638 rate_control_add_sta_debugfs(sta
);
640 sta
= __sta_info_unpin(sta
);
641 sta_info_destroy(sta
);
647 static void __ieee80211_run_pending_flush(struct ieee80211_local
*local
)
649 struct sta_info
*sta
;
654 spin_lock_irqsave(&local
->sta_lock
, flags
);
655 while (!list_empty(&local
->sta_flush_list
)) {
656 sta
= list_first_entry(&local
->sta_flush_list
,
657 struct sta_info
, list
);
658 list_del(&sta
->list
);
659 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
660 sta_info_destroy(sta
);
661 spin_lock_irqsave(&local
->sta_lock
, flags
);
663 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
666 static void ieee80211_sta_flush_work(struct work_struct
*work
)
668 struct ieee80211_local
*local
=
669 container_of(work
, struct ieee80211_local
, sta_flush_work
);
672 __ieee80211_run_pending_flush(local
);
676 void sta_info_init(struct ieee80211_local
*local
)
678 spin_lock_init(&local
->sta_lock
);
679 INIT_LIST_HEAD(&local
->sta_list
);
680 INIT_LIST_HEAD(&local
->sta_flush_list
);
681 INIT_WORK(&local
->sta_flush_work
, ieee80211_sta_flush_work
);
683 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
684 (unsigned long)local
);
685 local
->sta_cleanup
.expires
=
686 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
);
688 #ifdef CONFIG_MAC80211_DEBUGFS
689 INIT_WORK(&local
->sta_debugfs_add
, sta_info_debugfs_add_work
);
693 int sta_info_start(struct ieee80211_local
*local
)
695 add_timer(&local
->sta_cleanup
);
699 void sta_info_stop(struct ieee80211_local
*local
)
701 del_timer(&local
->sta_cleanup
);
702 cancel_work_sync(&local
->sta_flush_work
);
703 #ifdef CONFIG_MAC80211_DEBUGFS
705 * Make sure the debugfs adding work isn't pending after this
706 * because we're about to be destroyed. It doesn't matter
707 * whether it ran or not since we're going to flush all STAs
710 cancel_work_sync(&local
->sta_debugfs_add
);
714 sta_info_flush(local
, NULL
);
715 __ieee80211_run_pending_flush(local
);
720 * sta_info_flush - flush matching STA entries from the STA table
722 * Returns the number of removed STA entries.
724 * @local: local interface data
725 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
727 int sta_info_flush(struct ieee80211_local
*local
,
728 struct ieee80211_sub_if_data
*sdata
)
730 struct sta_info
*sta
, *tmp
;
738 spin_lock_irqsave(&local
->sta_lock
, flags
);
739 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
740 if (!sdata
|| sdata
== sta
->sdata
) {
741 __sta_info_unlink(&sta
);
743 list_add_tail(&sta
->list
, &tmp_list
);
748 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
750 list_for_each_entry_safe(sta
, tmp
, &tmp_list
, list
)
751 sta_info_destroy(sta
);
757 * sta_info_flush_delayed - flush matching STA entries from the STA table
759 * This function unlinks all stations for a given interface and queues
760 * them for freeing. Note that the workqueue function scheduled here has
761 * to run before any new keys can be added to the system to avoid set_key()
762 * callback ordering issues.
764 * @sdata: the interface
766 void sta_info_flush_delayed(struct ieee80211_sub_if_data
*sdata
)
768 struct ieee80211_local
*local
= sdata
->local
;
769 struct sta_info
*sta
, *tmp
;
773 spin_lock_irqsave(&local
->sta_lock
, flags
);
774 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
775 if (sdata
== sta
->sdata
) {
776 __sta_info_unlink(&sta
);
778 list_add_tail(&sta
->list
,
779 &local
->sta_flush_list
);
785 schedule_work(&local
->sta_flush_work
);
786 spin_unlock_irqrestore(&local
->sta_lock
, flags
);