PM / yenta: Split resume into early and late parts (rev. 4)
[linux/fpc-iii.git] / net / mac80211 / sta_info.c
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1 /*
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.
8 */
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 "driver-ops.h"
23 #include "rate.h"
24 #include "sta_info.h"
25 #include "debugfs_sta.h"
26 #include "mesh.h"
28 /**
29 * DOC: STA information lifetime rules
31 * STA info structures (&struct sta_info) are managed in a hash table
32 * for faster lookup and a list for iteration. They are managed using
33 * RCU, i.e. access to the list and hash table is protected by RCU.
35 * Upon allocating a STA info structure with sta_info_alloc(), the caller owns
36 * that structure. It must then either destroy it using sta_info_destroy()
37 * (which is pretty useless) or insert it into the hash table using
38 * sta_info_insert() which demotes the reference from ownership to a regular
39 * RCU-protected reference; if the function is called without protection by an
40 * RCU critical section the reference is instantly invalidated. Note that the
41 * caller may not do much with the STA info before inserting it, in particular,
42 * it may not start any mesh peer link management or add encryption keys.
44 * When the insertion fails (sta_info_insert()) returns non-zero), the
45 * structure will have been freed by sta_info_insert()!
47 * sta entries are added by mac80211 when you establish a link with a
48 * peer. This means different things for the different type of interfaces
49 * we support. For a regular station this mean we add the AP sta when we
50 * receive an assocation response from the AP. For IBSS this occurs when
51 * we receive a probe response or a beacon from target IBSS network. For
52 * WDS we add the sta for the peer imediately upon device open. When using
53 * AP mode we add stations for each respective station upon request from
54 * userspace through nl80211.
56 * Because there are debugfs entries for each station, and adding those
57 * must be able to sleep, it is also possible to "pin" a station entry,
58 * that means it can be removed from the hash table but not be freed.
59 * See the comment in __sta_info_unlink() for more information, this is
60 * an internal capability only.
62 * In order to remove a STA info structure, the caller needs to first
63 * unlink it (sta_info_unlink()) from the list and hash tables and
64 * then destroy it; sta_info_destroy() will wait for an RCU grace period
65 * to elapse before actually freeing it. Due to the pinning and the
66 * possibility of multiple callers trying to remove the same STA info at
67 * the same time, sta_info_unlink() can clear the STA info pointer it is
68 * passed to indicate that the STA info is owned by somebody else now.
70 * If sta_info_unlink() did not clear the pointer then the caller owns
71 * the STA info structure now and is responsible of destroying it with
72 * a call to sta_info_destroy().
74 * In all other cases, there is no concept of ownership on a STA entry,
75 * each structure is owned by the global hash table/list until it is
76 * removed. All users of the structure need to be RCU protected so that
77 * the structure won't be freed before they are done using it.
80 /* Caller must hold local->sta_lock */
81 static int sta_info_hash_del(struct ieee80211_local *local,
82 struct sta_info *sta)
84 struct sta_info *s;
86 s = local->sta_hash[STA_HASH(sta->sta.addr)];
87 if (!s)
88 return -ENOENT;
89 if (s == sta) {
90 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
91 s->hnext);
92 return 0;
95 while (s->hnext && s->hnext != sta)
96 s = s->hnext;
97 if (s->hnext) {
98 rcu_assign_pointer(s->hnext, sta->hnext);
99 return 0;
102 return -ENOENT;
105 /* protected by RCU */
106 struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
108 struct sta_info *sta;
110 sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
111 while (sta) {
112 if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
113 break;
114 sta = rcu_dereference(sta->hnext);
116 return sta;
119 struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
120 struct net_device *dev)
122 struct sta_info *sta;
123 int i = 0;
125 list_for_each_entry_rcu(sta, &local->sta_list, list) {
126 if (dev && dev != sta->sdata->dev)
127 continue;
128 if (i < idx) {
129 ++i;
130 continue;
132 return sta;
135 return NULL;
139 * __sta_info_free - internal STA free helper
141 * @local: pointer to the global information
142 * @sta: STA info to free
144 * This function must undo everything done by sta_info_alloc()
145 * that may happen before sta_info_insert().
147 static void __sta_info_free(struct ieee80211_local *local,
148 struct sta_info *sta)
150 rate_control_free_sta(sta);
151 rate_control_put(sta->rate_ctrl);
153 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
154 printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
155 wiphy_name(local->hw.wiphy), sta->sta.addr);
156 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
158 kfree(sta);
161 void sta_info_destroy(struct sta_info *sta)
163 struct ieee80211_local *local;
164 struct sk_buff *skb;
165 int i;
167 might_sleep();
169 if (!sta)
170 return;
172 local = sta->local;
174 rate_control_remove_sta_debugfs(sta);
175 ieee80211_sta_debugfs_remove(sta);
177 #ifdef CONFIG_MAC80211_MESH
178 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
179 mesh_plink_deactivate(sta);
180 #endif
183 * We have only unlinked the key, and actually destroying it
184 * may mean it is removed from hardware which requires that
185 * the key->sta pointer is still valid, so flush the key todo
186 * list here.
188 * ieee80211_key_todo() will synchronize_rcu() so after this
189 * nothing can reference this sta struct any more.
191 ieee80211_key_todo();
193 #ifdef CONFIG_MAC80211_MESH
194 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
195 del_timer_sync(&sta->plink_timer);
196 #endif
198 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
199 local->total_ps_buffered--;
200 dev_kfree_skb_any(skb);
203 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
204 dev_kfree_skb_any(skb);
206 for (i = 0; i < STA_TID_NUM; i++) {
207 struct tid_ampdu_rx *tid_rx;
208 struct tid_ampdu_tx *tid_tx;
210 spin_lock_bh(&sta->lock);
211 tid_rx = sta->ampdu_mlme.tid_rx[i];
212 /* Make sure timer won't free the tid_rx struct, see below */
213 if (tid_rx)
214 tid_rx->shutdown = true;
216 spin_unlock_bh(&sta->lock);
219 * Outside spinlock - shutdown is true now so that the timer
220 * won't free tid_rx, we have to do that now. Can't let the
221 * timer do it because we have to sync the timer outside the
222 * lock that it takes itself.
224 if (tid_rx) {
225 del_timer_sync(&tid_rx->session_timer);
226 kfree(tid_rx);
230 * No need to do such complications for TX agg sessions, the
231 * path leading to freeing the tid_tx struct goes via a call
232 * from the driver, and thus needs to look up the sta struct
233 * again, which cannot be found when we get here. Hence, we
234 * just need to delete the timer and free the aggregation
235 * info; we won't be telling the peer about it then but that
236 * doesn't matter if we're not talking to it again anyway.
238 tid_tx = sta->ampdu_mlme.tid_tx[i];
239 if (tid_tx) {
240 del_timer_sync(&tid_tx->addba_resp_timer);
242 * STA removed while aggregation session being
243 * started? Bit odd, but purge frames anyway.
245 skb_queue_purge(&tid_tx->pending);
246 kfree(tid_tx);
250 __sta_info_free(local, sta);
254 /* Caller must hold local->sta_lock */
255 static void sta_info_hash_add(struct ieee80211_local *local,
256 struct sta_info *sta)
258 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
259 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
262 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
263 u8 *addr, gfp_t gfp)
265 struct ieee80211_local *local = sdata->local;
266 struct sta_info *sta;
267 int i;
269 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
270 if (!sta)
271 return NULL;
273 spin_lock_init(&sta->lock);
274 spin_lock_init(&sta->flaglock);
276 memcpy(sta->sta.addr, addr, ETH_ALEN);
277 sta->local = local;
278 sta->sdata = sdata;
280 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
281 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
282 &sta->sta, gfp);
283 if (!sta->rate_ctrl_priv) {
284 rate_control_put(sta->rate_ctrl);
285 kfree(sta);
286 return NULL;
289 for (i = 0; i < STA_TID_NUM; i++) {
290 /* timer_to_tid must be initialized with identity mapping to
291 * enable session_timer's data differentiation. refer to
292 * sta_rx_agg_session_timer_expired for useage */
293 sta->timer_to_tid[i] = i;
294 /* rx */
295 sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
296 sta->ampdu_mlme.tid_rx[i] = NULL;
297 /* tx */
298 sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
299 sta->ampdu_mlme.tid_tx[i] = NULL;
300 sta->ampdu_mlme.addba_req_num[i] = 0;
302 skb_queue_head_init(&sta->ps_tx_buf);
303 skb_queue_head_init(&sta->tx_filtered);
305 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
306 sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX);
308 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
309 printk(KERN_DEBUG "%s: Allocated STA %pM\n",
310 wiphy_name(local->hw.wiphy), sta->sta.addr);
311 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
313 #ifdef CONFIG_MAC80211_MESH
314 sta->plink_state = PLINK_LISTEN;
315 init_timer(&sta->plink_timer);
316 #endif
318 return sta;
321 int sta_info_insert(struct sta_info *sta)
323 struct ieee80211_local *local = sta->local;
324 struct ieee80211_sub_if_data *sdata = sta->sdata;
325 unsigned long flags;
326 int err = 0;
329 * Can't be a WARN_ON because it can be triggered through a race:
330 * something inserts a STA (on one CPU) without holding the RTNL
331 * and another CPU turns off the net device.
333 if (unlikely(!netif_running(sdata->dev))) {
334 err = -ENETDOWN;
335 goto out_free;
338 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
339 is_multicast_ether_addr(sta->sta.addr))) {
340 err = -EINVAL;
341 goto out_free;
344 spin_lock_irqsave(&local->sta_lock, flags);
345 /* check if STA exists already */
346 if (sta_info_get(local, sta->sta.addr)) {
347 spin_unlock_irqrestore(&local->sta_lock, flags);
348 err = -EEXIST;
349 goto out_free;
351 list_add(&sta->list, &local->sta_list);
352 local->num_sta++;
353 sta_info_hash_add(local, sta);
355 /* notify driver */
356 if (local->ops->sta_notify) {
357 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
358 sdata = container_of(sdata->bss,
359 struct ieee80211_sub_if_data,
360 u.ap);
362 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, &sta->sta);
363 sdata = sta->sdata;
366 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
367 printk(KERN_DEBUG "%s: Inserted STA %pM\n",
368 wiphy_name(local->hw.wiphy), sta->sta.addr);
369 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
371 spin_unlock_irqrestore(&local->sta_lock, flags);
373 #ifdef CONFIG_MAC80211_DEBUGFS
375 * Debugfs entry adding might sleep, so schedule process
376 * context task for adding entry for STAs that do not yet
377 * have one.
378 * NOTE: due to auto-freeing semantics this may only be done
379 * if the insertion is successful!
381 schedule_work(&local->sta_debugfs_add);
382 #endif
384 if (ieee80211_vif_is_mesh(&sdata->vif))
385 mesh_accept_plinks_update(sdata);
387 return 0;
388 out_free:
389 BUG_ON(!err);
390 __sta_info_free(local, sta);
391 return err;
394 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
397 * This format has been mandated by the IEEE specifications,
398 * so this line may not be changed to use the __set_bit() format.
400 bss->tim[aid / 8] |= (1 << (aid % 8));
403 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
406 * This format has been mandated by the IEEE specifications,
407 * so this line may not be changed to use the __clear_bit() format.
409 bss->tim[aid / 8] &= ~(1 << (aid % 8));
412 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
413 struct sta_info *sta)
415 BUG_ON(!bss);
417 __bss_tim_set(bss, sta->sta.aid);
419 if (sta->local->ops->set_tim) {
420 sta->local->tim_in_locked_section = true;
421 drv_set_tim(sta->local, &sta->sta, true);
422 sta->local->tim_in_locked_section = false;
426 void sta_info_set_tim_bit(struct sta_info *sta)
428 unsigned long flags;
430 BUG_ON(!sta->sdata->bss);
432 spin_lock_irqsave(&sta->local->sta_lock, flags);
433 __sta_info_set_tim_bit(sta->sdata->bss, sta);
434 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
437 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
438 struct sta_info *sta)
440 BUG_ON(!bss);
442 __bss_tim_clear(bss, sta->sta.aid);
444 if (sta->local->ops->set_tim) {
445 sta->local->tim_in_locked_section = true;
446 drv_set_tim(sta->local, &sta->sta, false);
447 sta->local->tim_in_locked_section = false;
451 void sta_info_clear_tim_bit(struct sta_info *sta)
453 unsigned long flags;
455 BUG_ON(!sta->sdata->bss);
457 spin_lock_irqsave(&sta->local->sta_lock, flags);
458 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
459 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
462 static void __sta_info_unlink(struct sta_info **sta)
464 struct ieee80211_local *local = (*sta)->local;
465 struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
467 * pull caller's reference if we're already gone.
469 if (sta_info_hash_del(local, *sta)) {
470 *sta = NULL;
471 return;
474 if ((*sta)->key) {
475 ieee80211_key_free((*sta)->key);
476 WARN_ON((*sta)->key);
479 list_del(&(*sta)->list);
481 if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
482 BUG_ON(!sdata->bss);
484 atomic_dec(&sdata->bss->num_sta_ps);
485 __sta_info_clear_tim_bit(sdata->bss, *sta);
488 local->num_sta--;
490 if (local->ops->sta_notify) {
491 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
492 sdata = container_of(sdata->bss,
493 struct ieee80211_sub_if_data,
494 u.ap);
496 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
497 &(*sta)->sta);
498 sdata = (*sta)->sdata;
501 if (ieee80211_vif_is_mesh(&sdata->vif)) {
502 mesh_accept_plinks_update(sdata);
503 #ifdef CONFIG_MAC80211_MESH
504 del_timer(&(*sta)->plink_timer);
505 #endif
508 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
509 printk(KERN_DEBUG "%s: Removed STA %pM\n",
510 wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
511 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
514 * Finally, pull caller's reference if the STA is pinned by the
515 * task that is adding the debugfs entries. In that case, we
516 * leave the STA "to be freed".
518 * The rules are not trivial, but not too complex either:
519 * (1) pin_status is only modified under the sta_lock
520 * (2) STAs may only be pinned under the RTNL so that
521 * sta_info_flush() is guaranteed to actually destroy
522 * all STAs that are active for a given interface, this
523 * is required for correctness because otherwise we
524 * could notify a driver that an interface is going
525 * away and only after that (!) notify it about a STA
526 * on that interface going away.
527 * (3) sta_info_debugfs_add_work() will set the status
528 * to PINNED when it found an item that needs a new
529 * debugfs directory created. In that case, that item
530 * must not be freed although all *RCU* users are done
531 * with it. Hence, we tell the caller of _unlink()
532 * that the item is already gone (as can happen when
533 * two tasks try to unlink/destroy at the same time)
534 * (4) We set the pin_status to DESTROY here when we
535 * find such an item.
536 * (5) sta_info_debugfs_add_work() will reset the pin_status
537 * from PINNED to NORMAL when it is done with the item,
538 * but will check for DESTROY before resetting it in
539 * which case it will free the item.
541 if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
542 (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
543 *sta = NULL;
544 return;
548 void sta_info_unlink(struct sta_info **sta)
550 struct ieee80211_local *local = (*sta)->local;
551 unsigned long flags;
553 spin_lock_irqsave(&local->sta_lock, flags);
554 __sta_info_unlink(sta);
555 spin_unlock_irqrestore(&local->sta_lock, flags);
558 static int sta_info_buffer_expired(struct sta_info *sta,
559 struct sk_buff *skb)
561 struct ieee80211_tx_info *info;
562 int timeout;
564 if (!skb)
565 return 0;
567 info = IEEE80211_SKB_CB(skb);
569 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
570 timeout = (sta->listen_interval *
571 sta->sdata->vif.bss_conf.beacon_int *
572 32 / 15625) * HZ;
573 if (timeout < STA_TX_BUFFER_EXPIRE)
574 timeout = STA_TX_BUFFER_EXPIRE;
575 return time_after(jiffies, info->control.jiffies + timeout);
579 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
580 struct sta_info *sta)
582 unsigned long flags;
583 struct sk_buff *skb;
584 struct ieee80211_sub_if_data *sdata;
586 if (skb_queue_empty(&sta->ps_tx_buf))
587 return;
589 for (;;) {
590 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
591 skb = skb_peek(&sta->ps_tx_buf);
592 if (sta_info_buffer_expired(sta, skb))
593 skb = __skb_dequeue(&sta->ps_tx_buf);
594 else
595 skb = NULL;
596 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
598 if (!skb)
599 break;
601 sdata = sta->sdata;
602 local->total_ps_buffered--;
603 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
604 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
605 sta->sta.addr);
606 #endif
607 dev_kfree_skb(skb);
609 if (skb_queue_empty(&sta->ps_tx_buf))
610 sta_info_clear_tim_bit(sta);
615 static void sta_info_cleanup(unsigned long data)
617 struct ieee80211_local *local = (struct ieee80211_local *) data;
618 struct sta_info *sta;
620 rcu_read_lock();
621 list_for_each_entry_rcu(sta, &local->sta_list, list)
622 sta_info_cleanup_expire_buffered(local, sta);
623 rcu_read_unlock();
625 if (local->quiescing)
626 return;
628 local->sta_cleanup.expires =
629 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
630 add_timer(&local->sta_cleanup);
633 #ifdef CONFIG_MAC80211_DEBUGFS
635 * See comment in __sta_info_unlink,
636 * caller must hold local->sta_lock.
638 static void __sta_info_pin(struct sta_info *sta)
640 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
641 sta->pin_status = STA_INFO_PIN_STAT_PINNED;
645 * See comment in __sta_info_unlink, returns sta if it
646 * needs to be destroyed.
648 static struct sta_info *__sta_info_unpin(struct sta_info *sta)
650 struct sta_info *ret = NULL;
651 unsigned long flags;
653 spin_lock_irqsave(&sta->local->sta_lock, flags);
654 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
655 sta->pin_status != STA_INFO_PIN_STAT_PINNED);
656 if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
657 ret = sta;
658 sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
659 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
661 return ret;
664 static void sta_info_debugfs_add_work(struct work_struct *work)
666 struct ieee80211_local *local =
667 container_of(work, struct ieee80211_local, sta_debugfs_add);
668 struct sta_info *sta, *tmp;
669 unsigned long flags;
671 /* We need to keep the RTNL across the whole pinned status. */
672 rtnl_lock();
673 while (1) {
674 sta = NULL;
676 spin_lock_irqsave(&local->sta_lock, flags);
677 list_for_each_entry(tmp, &local->sta_list, list) {
679 * debugfs.add_has_run will be set by
680 * ieee80211_sta_debugfs_add regardless
681 * of what else it does.
683 if (!tmp->debugfs.add_has_run) {
684 sta = tmp;
685 __sta_info_pin(sta);
686 break;
689 spin_unlock_irqrestore(&local->sta_lock, flags);
691 if (!sta)
692 break;
694 ieee80211_sta_debugfs_add(sta);
695 rate_control_add_sta_debugfs(sta);
697 sta = __sta_info_unpin(sta);
698 sta_info_destroy(sta);
700 rtnl_unlock();
702 #endif
704 void sta_info_init(struct ieee80211_local *local)
706 spin_lock_init(&local->sta_lock);
707 INIT_LIST_HEAD(&local->sta_list);
709 setup_timer(&local->sta_cleanup, sta_info_cleanup,
710 (unsigned long)local);
711 local->sta_cleanup.expires =
712 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
714 #ifdef CONFIG_MAC80211_DEBUGFS
715 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
716 #endif
719 int sta_info_start(struct ieee80211_local *local)
721 add_timer(&local->sta_cleanup);
722 return 0;
725 void sta_info_stop(struct ieee80211_local *local)
727 del_timer(&local->sta_cleanup);
728 #ifdef CONFIG_MAC80211_DEBUGFS
730 * Make sure the debugfs adding work isn't pending after this
731 * because we're about to be destroyed. It doesn't matter
732 * whether it ran or not since we're going to flush all STAs
733 * anyway.
735 cancel_work_sync(&local->sta_debugfs_add);
736 #endif
738 sta_info_flush(local, NULL);
742 * sta_info_flush - flush matching STA entries from the STA table
744 * Returns the number of removed STA entries.
746 * @local: local interface data
747 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
749 int sta_info_flush(struct ieee80211_local *local,
750 struct ieee80211_sub_if_data *sdata)
752 struct sta_info *sta, *tmp;
753 LIST_HEAD(tmp_list);
754 int ret = 0;
755 unsigned long flags;
757 might_sleep();
759 spin_lock_irqsave(&local->sta_lock, flags);
760 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
761 if (!sdata || sdata == sta->sdata) {
762 __sta_info_unlink(&sta);
763 if (sta) {
764 list_add_tail(&sta->list, &tmp_list);
765 ret++;
769 spin_unlock_irqrestore(&local->sta_lock, flags);
771 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
772 sta_info_destroy(sta);
774 return ret;
777 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
778 unsigned long exp_time)
780 struct ieee80211_local *local = sdata->local;
781 struct sta_info *sta, *tmp;
782 LIST_HEAD(tmp_list);
783 unsigned long flags;
785 spin_lock_irqsave(&local->sta_lock, flags);
786 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
787 if (time_after(jiffies, sta->last_rx + exp_time)) {
788 #ifdef CONFIG_MAC80211_IBSS_DEBUG
789 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
790 sdata->dev->name, sta->sta.addr);
791 #endif
792 __sta_info_unlink(&sta);
793 if (sta)
794 list_add(&sta->list, &tmp_list);
796 spin_unlock_irqrestore(&local->sta_lock, flags);
798 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
799 sta_info_destroy(sta);
802 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
803 const u8 *addr)
805 struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
807 if (!sta)
808 return NULL;
809 return &sta->sta;
811 EXPORT_SYMBOL(ieee80211_find_sta);