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"
22 #include "ieee80211_rate.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 while holding the RTNL; sta_info_destroy() will wait
55 * for an RCU grace period to elapse before actually freeing it. Due to
56 * the pinning and the possibility of multiple callers trying to remove
57 * the same STA info at the same time, sta_info_unlink() can clear the
58 * STA info pointer it is passed to indicate that the STA info is owned
59 * by somebody else now.
61 * If sta_info_unlink() did not clear the pointer then the caller owns
62 * the STA info structure now and is responsible of destroying it with
63 * a call to sta_info_destroy(), not before RCU synchronisation, of
64 * course. Note that sta_info_destroy() must be protected by the RTNL.
66 * In all other cases, there is no concept of ownership on a STA entry,
67 * each structure is owned by the global hash table/list until it is
68 * removed. All users of the structure need to be RCU protected so that
69 * the structure won't be freed before they are done using it.
72 /* Caller must hold local->sta_lock */
73 static int sta_info_hash_del(struct ieee80211_local
*local
,
78 s
= local
->sta_hash
[STA_HASH(sta
->addr
)];
82 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->addr
)],
87 while (s
->hnext
&& s
->hnext
!= sta
)
90 rcu_assign_pointer(s
->hnext
, sta
->hnext
);
97 /* protected by RCU */
98 static struct sta_info
*__sta_info_find(struct ieee80211_local
*local
,
101 struct sta_info
*sta
;
103 sta
= rcu_dereference(local
->sta_hash
[STA_HASH(addr
)]);
105 if (compare_ether_addr(sta
->addr
, addr
) == 0)
107 sta
= rcu_dereference(sta
->hnext
);
112 struct sta_info
*sta_info_get(struct ieee80211_local
*local
, u8
*addr
)
114 return __sta_info_find(local
, addr
);
116 EXPORT_SYMBOL(sta_info_get
);
118 struct sta_info
*sta_info_get_by_idx(struct ieee80211_local
*local
, int idx
,
119 struct net_device
*dev
)
121 struct sta_info
*sta
;
124 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
125 if (dev
&& dev
!= sta
->sdata
->dev
)
138 * __sta_info_free - internal STA free helper
140 * @sta: STA info to free
142 * This function must undo everything done by sta_info_alloc()
143 * that may happen before sta_info_insert().
145 static void __sta_info_free(struct ieee80211_local
*local
,
146 struct sta_info
*sta
)
148 DECLARE_MAC_BUF(mbuf
);
150 rate_control_free_sta(sta
->rate_ctrl
, sta
->rate_ctrl_priv
);
151 rate_control_put(sta
->rate_ctrl
);
153 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
154 printk(KERN_DEBUG
"%s: Destroyed STA %s\n",
155 wiphy_name(local
->hw
.wiphy
), print_mac(mbuf
, sta
->addr
));
156 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
161 void sta_info_destroy(struct sta_info
*sta
)
163 struct ieee80211_local
*local
;
175 rate_control_remove_sta_debugfs(sta
);
176 ieee80211_sta_debugfs_remove(sta
);
178 #ifdef CONFIG_MAC80211_MESH
179 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
180 mesh_plink_deactivate(sta
);
185 * NOTE: This will call synchronize_rcu() internally to
186 * make sure no key references can be in use. We rely on
187 * that when we take this branch to make sure nobody can
188 * reference this STA struct any longer!
190 ieee80211_key_free(sta
->key
);
194 * Make sure that nobody can reference this STA struct
200 #ifdef CONFIG_MAC80211_MESH
201 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
202 del_timer_sync(&sta
->plink_timer
);
205 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
206 local
->total_ps_buffered
--;
207 dev_kfree_skb_any(skb
);
210 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
)
211 dev_kfree_skb_any(skb
);
213 for (i
= 0; i
< STA_TID_NUM
; i
++) {
214 spin_lock_bh(&sta
->ampdu_mlme
.ampdu_rx
);
215 if (sta
->ampdu_mlme
.tid_rx
[i
])
216 del_timer_sync(&sta
->ampdu_mlme
.tid_rx
[i
]->session_timer
);
217 spin_unlock_bh(&sta
->ampdu_mlme
.ampdu_rx
);
218 spin_lock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
219 if (sta
->ampdu_mlme
.tid_tx
[i
])
220 del_timer_sync(&sta
->ampdu_mlme
.tid_tx
[i
]->addba_resp_timer
);
221 spin_unlock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
224 __sta_info_free(local
, sta
);
228 /* Caller must hold local->sta_lock */
229 static void sta_info_hash_add(struct ieee80211_local
*local
,
230 struct sta_info
*sta
)
232 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->addr
)];
233 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->addr
)], sta
);
236 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
239 struct ieee80211_local
*local
= sdata
->local
;
240 struct sta_info
*sta
;
242 DECLARE_MAC_BUF(mbuf
);
244 sta
= kzalloc(sizeof(*sta
), gfp
);
248 memcpy(sta
->addr
, addr
, ETH_ALEN
);
252 sta
->rate_ctrl
= rate_control_get(local
->rate_ctrl
);
253 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
255 if (!sta
->rate_ctrl_priv
) {
256 rate_control_put(sta
->rate_ctrl
);
261 spin_lock_init(&sta
->ampdu_mlme
.ampdu_rx
);
262 spin_lock_init(&sta
->ampdu_mlme
.ampdu_tx
);
263 for (i
= 0; i
< STA_TID_NUM
; i
++) {
264 /* timer_to_tid must be initialized with identity mapping to
265 * enable session_timer's data differentiation. refer to
266 * sta_rx_agg_session_timer_expired for useage */
267 sta
->timer_to_tid
[i
] = i
;
268 /* tid to tx queue: initialize according to HW (0 is valid) */
269 sta
->tid_to_tx_q
[i
] = local
->hw
.queues
;
271 sta
->ampdu_mlme
.tid_state_rx
[i
] = HT_AGG_STATE_IDLE
;
272 sta
->ampdu_mlme
.tid_rx
[i
] = NULL
;
274 sta
->ampdu_mlme
.tid_state_tx
[i
] = HT_AGG_STATE_IDLE
;
275 sta
->ampdu_mlme
.tid_tx
[i
] = NULL
;
276 sta
->ampdu_mlme
.addba_req_num
[i
] = 0;
278 skb_queue_head_init(&sta
->ps_tx_buf
);
279 skb_queue_head_init(&sta
->tx_filtered
);
281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
282 printk(KERN_DEBUG
"%s: Allocated STA %s\n",
283 wiphy_name(local
->hw
.wiphy
), print_mac(mbuf
, sta
->addr
));
284 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
286 #ifdef CONFIG_MAC80211_MESH
287 sta
->plink_state
= PLINK_LISTEN
;
288 spin_lock_init(&sta
->plink_lock
);
289 init_timer(&sta
->plink_timer
);
295 int sta_info_insert(struct sta_info
*sta
)
297 struct ieee80211_local
*local
= sta
->local
;
298 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
301 DECLARE_MAC_BUF(mac
);
304 * Can't be a WARN_ON because it can be triggered through a race:
305 * something inserts a STA (on one CPU) without holding the RTNL
306 * and another CPU turns off the net device.
308 if (unlikely(!netif_running(sdata
->dev
))) {
313 if (WARN_ON(compare_ether_addr(sta
->addr
, sdata
->dev
->dev_addr
) == 0 ||
314 is_multicast_ether_addr(sta
->addr
))) {
319 spin_lock_irqsave(&local
->sta_lock
, flags
);
320 /* check if STA exists already */
321 if (__sta_info_find(local
, sta
->addr
)) {
322 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
326 list_add(&sta
->list
, &local
->sta_list
);
328 sta_info_hash_add(local
, sta
);
331 if (local
->ops
->sta_notify
) {
332 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_VLAN
)
333 sdata
= sdata
->u
.vlan
.ap
;
335 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
336 STA_NOTIFY_ADD
, sta
->addr
);
339 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
340 printk(KERN_DEBUG
"%s: Inserted STA %s\n",
341 wiphy_name(local
->hw
.wiphy
), print_mac(mac
, sta
->addr
));
342 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
344 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
346 #ifdef CONFIG_MAC80211_DEBUGFS
348 * Debugfs entry adding might sleep, so schedule process
349 * context task for adding entry for STAs that do not yet
351 * NOTE: due to auto-freeing semantics this may only be done
352 * if the insertion is successful!
354 queue_work(local
->hw
.workqueue
, &local
->sta_debugfs_add
);
357 if (ieee80211_vif_is_mesh(&sdata
->vif
))
358 mesh_accept_plinks_update(sdata
);
363 __sta_info_free(local
, sta
);
367 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
370 * This format has been mandated by the IEEE specifications,
371 * so this line may not be changed to use the __set_bit() format.
373 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
376 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
379 * This format has been mandated by the IEEE specifications,
380 * so this line may not be changed to use the __clear_bit() format.
382 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
385 static void __sta_info_set_tim_bit(struct ieee80211_if_ap
*bss
,
386 struct sta_info
*sta
)
389 __bss_tim_set(bss
, sta
->aid
);
390 if (sta
->local
->ops
->set_tim
) {
391 sta
->local
->tim_in_locked_section
= true;
392 sta
->local
->ops
->set_tim(local_to_hw(sta
->local
), sta
->aid
, 1);
393 sta
->local
->tim_in_locked_section
= false;
397 void sta_info_set_tim_bit(struct sta_info
*sta
)
401 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
402 __sta_info_set_tim_bit(sta
->sdata
->bss
, sta
);
403 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
406 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap
*bss
,
407 struct sta_info
*sta
)
410 __bss_tim_clear(bss
, sta
->aid
);
411 if (sta
->local
->ops
->set_tim
) {
412 sta
->local
->tim_in_locked_section
= true;
413 sta
->local
->ops
->set_tim(local_to_hw(sta
->local
), sta
->aid
, 0);
414 sta
->local
->tim_in_locked_section
= false;
418 void sta_info_clear_tim_bit(struct sta_info
*sta
)
422 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
423 __sta_info_clear_tim_bit(sta
->sdata
->bss
, sta
);
424 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
428 * See comment in __sta_info_unlink,
429 * caller must hold local->sta_lock.
431 static void __sta_info_pin(struct sta_info
*sta
)
433 WARN_ON(sta
->pin_status
!= STA_INFO_PIN_STAT_NORMAL
);
434 sta
->pin_status
= STA_INFO_PIN_STAT_PINNED
;
438 * See comment in __sta_info_unlink, returns sta if it
439 * needs to be destroyed.
441 static struct sta_info
*__sta_info_unpin(struct sta_info
*sta
)
443 struct sta_info
*ret
= NULL
;
446 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
447 WARN_ON(sta
->pin_status
!= STA_INFO_PIN_STAT_DESTROY
&&
448 sta
->pin_status
!= STA_INFO_PIN_STAT_PINNED
);
449 if (sta
->pin_status
== STA_INFO_PIN_STAT_DESTROY
)
451 sta
->pin_status
= STA_INFO_PIN_STAT_NORMAL
;
452 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
457 void __sta_info_unlink(struct sta_info
**sta
)
459 struct ieee80211_local
*local
= (*sta
)->local
;
460 struct ieee80211_sub_if_data
*sdata
= (*sta
)->sdata
;
461 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
462 DECLARE_MAC_BUF(mbuf
);
465 * pull caller's reference if we're already gone.
467 if (sta_info_hash_del(local
, *sta
)) {
473 * Also pull caller's reference if the STA is pinned by the
474 * task that is adding the debugfs entries. In that case, we
475 * leave the STA "to be freed".
477 * The rules are not trivial, but not too complex either:
478 * (1) pin_status is only modified under the sta_lock
479 * (2) 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 * (3) We set the pin_status to DESTROY here when we
488 * (4) 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
;
499 list_del(&(*sta
)->list
);
501 if ((*sta
)->flags
& WLAN_STA_PS
) {
502 (*sta
)->flags
&= ~WLAN_STA_PS
;
504 atomic_dec(&sdata
->bss
->num_sta_ps
);
505 __sta_info_clear_tim_bit(sdata
->bss
, *sta
);
510 if (local
->ops
->sta_notify
) {
511 if (sdata
->vif
.type
== IEEE80211_IF_TYPE_VLAN
)
512 sdata
= sdata
->u
.vlan
.ap
;
514 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
515 STA_NOTIFY_REMOVE
, (*sta
)->addr
);
518 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
519 mesh_accept_plinks_update(sdata
);
520 #ifdef CONFIG_MAC80211_MESH
521 del_timer(&(*sta
)->plink_timer
);
525 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
526 printk(KERN_DEBUG
"%s: Removed STA %s\n",
527 wiphy_name(local
->hw
.wiphy
), print_mac(mbuf
, (*sta
)->addr
));
528 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
531 void sta_info_unlink(struct sta_info
**sta
)
533 struct ieee80211_local
*local
= (*sta
)->local
;
536 spin_lock_irqsave(&local
->sta_lock
, flags
);
537 __sta_info_unlink(sta
);
538 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
541 static inline int sta_info_buffer_expired(struct ieee80211_local
*local
,
542 struct sta_info
*sta
,
545 struct ieee80211_tx_packet_data
*pkt_data
;
551 pkt_data
= (struct ieee80211_tx_packet_data
*) skb
->cb
;
553 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
554 timeout
= (sta
->listen_interval
* local
->hw
.conf
.beacon_int
* 32 /
556 if (timeout
< STA_TX_BUFFER_EXPIRE
)
557 timeout
= STA_TX_BUFFER_EXPIRE
;
558 return time_after(jiffies
, pkt_data
->jiffies
+ timeout
);
562 static void sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
563 struct sta_info
*sta
)
567 struct ieee80211_sub_if_data
*sdata
;
568 DECLARE_MAC_BUF(mac
);
570 if (skb_queue_empty(&sta
->ps_tx_buf
))
574 spin_lock_irqsave(&sta
->ps_tx_buf
.lock
, flags
);
575 skb
= skb_peek(&sta
->ps_tx_buf
);
576 if (sta_info_buffer_expired(local
, sta
, skb
))
577 skb
= __skb_dequeue(&sta
->ps_tx_buf
);
580 spin_unlock_irqrestore(&sta
->ps_tx_buf
.lock
, flags
);
586 local
->total_ps_buffered
--;
587 printk(KERN_DEBUG
"Buffered frame expired (STA "
588 "%s)\n", print_mac(mac
, sta
->addr
));
591 if (skb_queue_empty(&sta
->ps_tx_buf
))
592 sta_info_clear_tim_bit(sta
);
597 static void sta_info_cleanup(unsigned long data
)
599 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
600 struct sta_info
*sta
;
603 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
604 sta_info_cleanup_expire_buffered(local
, sta
);
607 local
->sta_cleanup
.expires
=
608 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
);
609 add_timer(&local
->sta_cleanup
);
612 #ifdef CONFIG_MAC80211_DEBUGFS
613 static void sta_info_debugfs_add_work(struct work_struct
*work
)
615 struct ieee80211_local
*local
=
616 container_of(work
, struct ieee80211_local
, sta_debugfs_add
);
617 struct sta_info
*sta
, *tmp
;
623 spin_lock_irqsave(&local
->sta_lock
, flags
);
624 list_for_each_entry(tmp
, &local
->sta_list
, list
) {
625 if (!tmp
->debugfs
.dir
) {
631 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
636 ieee80211_sta_debugfs_add(sta
);
637 rate_control_add_sta_debugfs(sta
);
639 sta
= __sta_info_unpin(sta
);
641 sta_info_destroy(sta
);
647 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
);
705 sta_info_flush(local
, NULL
);
706 __ieee80211_run_pending_flush(local
);
711 * sta_info_flush - flush matching STA entries from the STA table
713 * Returns the number of removed STA entries.
715 * @local: local interface data
716 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
718 int sta_info_flush(struct ieee80211_local
*local
,
719 struct ieee80211_sub_if_data
*sdata
)
721 struct sta_info
*sta
, *tmp
;
729 spin_lock_irqsave(&local
->sta_lock
, flags
);
730 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
731 if (!sdata
|| sdata
== sta
->sdata
) {
732 __sta_info_unlink(&sta
);
734 list_add_tail(&sta
->list
, &tmp_list
);
739 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
741 list_for_each_entry_safe(sta
, tmp
, &tmp_list
, list
)
742 sta_info_destroy(sta
);
748 * sta_info_flush_delayed - flush matching STA entries from the STA table
750 * This function unlinks all stations for a given interface and queues
751 * them for freeing. Note that the workqueue function scheduled here has
752 * to run before any new keys can be added to the system to avoid set_key()
753 * callback ordering issues.
755 * @sdata: the interface
757 void sta_info_flush_delayed(struct ieee80211_sub_if_data
*sdata
)
759 struct ieee80211_local
*local
= sdata
->local
;
760 struct sta_info
*sta
, *tmp
;
764 spin_lock_irqsave(&local
->sta_lock
, flags
);
765 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
766 if (sdata
== sta
->sdata
) {
767 __sta_info_unlink(&sta
);
769 list_add_tail(&sta
->list
,
770 &local
->sta_flush_list
);
776 schedule_work(&local
->sta_flush_work
);
777 spin_unlock_irqrestore(&local
->sta_lock
, flags
);