X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fmac80211%2Fsta_info.c;h=594f2318c3d82daf25dfac1cc387ac01500f0dc8;hb=fbc44bf7177dfd61381da55405550b693943a432;hp=c24770cb02c5d696f160136c497f2a9544747128;hpb=e2530083609148a7835b54c431f6b8956407c1f6;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index c24770c..594f231 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -19,6 +19,7 @@
 
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
+#include "driver-ops.h"
 #include "rate.h"
 #include "sta_info.h"
 #include "debugfs_sta.h"
@@ -43,6 +44,15 @@
  * When the insertion fails (sta_info_insert()) returns non-zero), the
  * structure will have been freed by sta_info_insert()!
  *
+ * sta entries are added by mac80211 when you establish a link with a
+ * peer. This means different things for the different type of interfaces
+ * we support. For a regular station this mean we add the AP sta when we
+ * receive an assocation response from the AP. For IBSS this occurs when
+ * we receive a probe response or a beacon from target IBSS network. For
+ * WDS we add the sta for the peer imediately upon device open. When using
+ * AP mode we add stations for each respective station upon request from
+ * userspace through nl80211.
+ *
  * Because there are debugfs entries for each station, and adding those
  * must be able to sleep, it is also possible to "pin" a station entry,
  * that means it can be removed from the hash table but not be freed.
@@ -73,11 +83,11 @@ static int sta_info_hash_del(struct ieee80211_local *local,
 {
 	struct sta_info *s;
 
-	s = local->sta_hash[STA_HASH(sta->addr)];
+	s = local->sta_hash[STA_HASH(sta->sta.addr)];
 	if (!s)
 		return -ENOENT;
 	if (s == sta) {
-		rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)],
+		rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
 				   s->hnext);
 		return 0;
 	}
@@ -93,26 +103,19 @@ static int sta_info_hash_del(struct ieee80211_local *local,
 }
 
 /* protected by RCU */
-static struct sta_info *__sta_info_find(struct ieee80211_local *local,
-					u8 *addr)
+struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
 {
 	struct sta_info *sta;
 
 	sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
 	while (sta) {
-		if (compare_ether_addr(sta->addr, addr) == 0)
+		if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
 			break;
 		sta = rcu_dereference(sta->hnext);
 	}
 	return sta;
 }
 
-struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
-{
-	return __sta_info_find(local, addr);
-}
-EXPORT_SYMBOL(sta_info_get);
-
 struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
 				     struct net_device *dev)
 {
@@ -135,6 +138,7 @@ struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
 /**
  * __sta_info_free - internal STA free helper
  *
+ * @local: pointer to the global information
  * @sta: STA info to free
  *
  * This function must undo everything done by sta_info_alloc()
@@ -143,14 +147,12 @@ struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
 static void __sta_info_free(struct ieee80211_local *local,
 			    struct sta_info *sta)
 {
-	DECLARE_MAC_BUF(mbuf);
-
-	rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
+	rate_control_free_sta(sta);
 	rate_control_put(sta->rate_ctrl);
 
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	printk(KERN_DEBUG "%s: Destroyed STA %s\n",
-	       wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr));
+	printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
+	       wiphy_name(local->hw.wiphy), sta->sta.addr);
 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 
 	kfree(sta);
@@ -202,12 +204,47 @@ void sta_info_destroy(struct sta_info *sta)
 		dev_kfree_skb_any(skb);
 
 	for (i = 0; i <  STA_TID_NUM; i++) {
+		struct tid_ampdu_rx *tid_rx;
+		struct tid_ampdu_tx *tid_tx;
+
 		spin_lock_bh(&sta->lock);
-		if (sta->ampdu_mlme.tid_rx[i])
-		  del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer);
-		if (sta->ampdu_mlme.tid_tx[i])
-		  del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer);
+		tid_rx = sta->ampdu_mlme.tid_rx[i];
+		/* Make sure timer won't free the tid_rx struct, see below */
+		if (tid_rx)
+			tid_rx->shutdown = true;
+
 		spin_unlock_bh(&sta->lock);
+
+		/*
+		 * Outside spinlock - shutdown is true now so that the timer
+		 * won't free tid_rx, we have to do that now. Can't let the
+		 * timer do it because we have to sync the timer outside the
+		 * lock that it takes itself.
+		 */
+		if (tid_rx) {
+			del_timer_sync(&tid_rx->session_timer);
+			kfree(tid_rx);
+		}
+
+		/*
+		 * No need to do such complications for TX agg sessions, the
+		 * path leading to freeing the tid_tx struct goes via a call
+		 * from the driver, and thus needs to look up the sta struct
+		 * again, which cannot be found when we get here. Hence, we
+		 * just need to delete the timer and free the aggregation
+		 * info; we won't be telling the peer about it then but that
+		 * doesn't matter if we're not talking to it again anyway.
+		 */
+		tid_tx = sta->ampdu_mlme.tid_tx[i];
+		if (tid_tx) {
+			del_timer_sync(&tid_tx->addba_resp_timer);
+			/*
+			 * STA removed while aggregation session being
+			 * started? Bit odd, but purge frames anyway.
+			 */
+			skb_queue_purge(&tid_tx->pending);
+			kfree(tid_tx);
+		}
 	}
 
 	__sta_info_free(local, sta);
@@ -218,8 +255,8 @@ void sta_info_destroy(struct sta_info *sta)
 static void sta_info_hash_add(struct ieee80211_local *local,
 			      struct sta_info *sta)
 {
-	sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
-	rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], sta);
+	sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
+	rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
 }
 
 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
@@ -228,21 +265,21 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 	struct ieee80211_local *local = sdata->local;
 	struct sta_info *sta;
 	int i;
-	DECLARE_MAC_BUF(mbuf);
 
-	sta = kzalloc(sizeof(*sta), gfp);
+	sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
 	if (!sta)
 		return NULL;
 
 	spin_lock_init(&sta->lock);
+	spin_lock_init(&sta->flaglock);
 
-	memcpy(sta->addr, addr, ETH_ALEN);
+	memcpy(sta->sta.addr, addr, ETH_ALEN);
 	sta->local = local;
 	sta->sdata = sdata;
 
 	sta->rate_ctrl = rate_control_get(local->rate_ctrl);
 	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
-						     gfp);
+						     &sta->sta, gfp);
 	if (!sta->rate_ctrl_priv) {
 		rate_control_put(sta->rate_ctrl);
 		kfree(sta);
@@ -254,8 +291,6 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 		 * enable session_timer's data differentiation. refer to
 		 * sta_rx_agg_session_timer_expired for useage */
 		sta->timer_to_tid[i] = i;
-		/* tid to tx queue: initialize according to HW (0 is valid) */
-		sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw);
 		/* rx */
 		sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
 		sta->ampdu_mlme.tid_rx[i] = NULL;
@@ -267,9 +302,12 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 	skb_queue_head_init(&sta->ps_tx_buf);
 	skb_queue_head_init(&sta->tx_filtered);
 
+	for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
+		sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX);
+
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	printk(KERN_DEBUG "%s: Allocated STA %s\n",
-	       wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr));
+	printk(KERN_DEBUG "%s: Allocated STA %pM\n",
+	       wiphy_name(local->hw.wiphy), sta->sta.addr);
 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 
 #ifdef CONFIG_MAC80211_MESH
@@ -286,7 +324,6 @@ int sta_info_insert(struct sta_info *sta)
 	struct ieee80211_sub_if_data *sdata = sta->sdata;
 	unsigned long flags;
 	int err = 0;
-	DECLARE_MAC_BUF(mac);
 
 	/*
 	 * Can't be a WARN_ON because it can be triggered through a race:
@@ -298,35 +335,38 @@ int sta_info_insert(struct sta_info *sta)
 		goto out_free;
 	}
 
-	if (WARN_ON(compare_ether_addr(sta->addr, sdata->dev->dev_addr) == 0 ||
-	            is_multicast_ether_addr(sta->addr))) {
+	if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
+		    is_multicast_ether_addr(sta->sta.addr))) {
 		err = -EINVAL;
 		goto out_free;
 	}
 
 	spin_lock_irqsave(&local->sta_lock, flags);
 	/* check if STA exists already */
-	if (__sta_info_find(local, sta->addr)) {
+	if (sta_info_get(local, sta->sta.addr)) {
 		spin_unlock_irqrestore(&local->sta_lock, flags);
 		err = -EEXIST;
 		goto out_free;
 	}
 	list_add(&sta->list, &local->sta_list);
+	local->sta_generation++;
 	local->num_sta++;
 	sta_info_hash_add(local, sta);
 
 	/* notify driver */
 	if (local->ops->sta_notify) {
-		if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
-			sdata = sdata->u.vlan.ap;
+		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+			sdata = container_of(sdata->bss,
+					     struct ieee80211_sub_if_data,
+					     u.ap);
 
-		local->ops->sta_notify(local_to_hw(local), &sdata->vif,
-				       STA_NOTIFY_ADD, sta->addr);
+		drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, &sta->sta);
+		sdata = sta->sdata;
 	}
 
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	printk(KERN_DEBUG "%s: Inserted STA %s\n",
-	       wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
+	printk(KERN_DEBUG "%s: Inserted STA %pM\n",
+	       wiphy_name(local->hw.wiphy), sta->sta.addr);
 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 
 	spin_unlock_irqrestore(&local->sta_lock, flags);
@@ -373,11 +413,13 @@ static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
 				   struct sta_info *sta)
 {
-	if (bss)
-		__bss_tim_set(bss, sta->aid);
+	BUG_ON(!bss);
+
+	__bss_tim_set(bss, sta->sta.aid);
+
 	if (sta->local->ops->set_tim) {
 		sta->local->tim_in_locked_section = true;
-		sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1);
+		drv_set_tim(sta->local, &sta->sta, true);
 		sta->local->tim_in_locked_section = false;
 	}
 }
@@ -386,6 +428,8 @@ void sta_info_set_tim_bit(struct sta_info *sta)
 {
 	unsigned long flags;
 
+	BUG_ON(!sta->sdata->bss);
+
 	spin_lock_irqsave(&sta->local->sta_lock, flags);
 	__sta_info_set_tim_bit(sta->sdata->bss, sta);
 	spin_unlock_irqrestore(&sta->local->sta_lock, flags);
@@ -394,11 +438,13 @@ void sta_info_set_tim_bit(struct sta_info *sta)
 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
 				     struct sta_info *sta)
 {
-	if (bss)
-		__bss_tim_clear(bss, sta->aid);
+	BUG_ON(!bss);
+
+	__bss_tim_clear(bss, sta->sta.aid);
+
 	if (sta->local->ops->set_tim) {
 		sta->local->tim_in_locked_section = true;
-		sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0);
+		drv_set_tim(sta->local, &sta->sta, false);
 		sta->local->tim_in_locked_section = false;
 	}
 }
@@ -407,18 +453,17 @@ void sta_info_clear_tim_bit(struct sta_info *sta)
 {
 	unsigned long flags;
 
+	BUG_ON(!sta->sdata->bss);
+
 	spin_lock_irqsave(&sta->local->sta_lock, flags);
 	__sta_info_clear_tim_bit(sta->sdata->bss, sta);
 	spin_unlock_irqrestore(&sta->local->sta_lock, flags);
 }
 
-void __sta_info_unlink(struct sta_info **sta)
+static void __sta_info_unlink(struct sta_info **sta)
 {
 	struct ieee80211_local *local = (*sta)->local;
 	struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	DECLARE_MAC_BUF(mbuf);
-#endif
 	/*
 	 * pull caller's reference if we're already gone.
 	 */
@@ -435,19 +480,24 @@ void __sta_info_unlink(struct sta_info **sta)
 	list_del(&(*sta)->list);
 
 	if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
-		if (sdata->bss)
-			atomic_dec(&sdata->bss->num_sta_ps);
+		BUG_ON(!sdata->bss);
+
+		atomic_dec(&sdata->bss->num_sta_ps);
 		__sta_info_clear_tim_bit(sdata->bss, *sta);
 	}
 
 	local->num_sta--;
+	local->sta_generation++;
 
 	if (local->ops->sta_notify) {
-		if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
-			sdata = sdata->u.vlan.ap;
-
-		local->ops->sta_notify(local_to_hw(local), &sdata->vif,
-				       STA_NOTIFY_REMOVE, (*sta)->addr);
+		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+			sdata = container_of(sdata->bss,
+					     struct ieee80211_sub_if_data,
+					     u.ap);
+
+		drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
+			       &(*sta)->sta);
+		sdata = (*sta)->sdata;
 	}
 
 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
@@ -458,8 +508,8 @@ void __sta_info_unlink(struct sta_info **sta)
 	}
 
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
-	printk(KERN_DEBUG "%s: Removed STA %s\n",
-	       wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->addr));
+	printk(KERN_DEBUG "%s: Removed STA %pM\n",
+	       wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 
 	/*
@@ -507,9 +557,8 @@ void sta_info_unlink(struct sta_info **sta)
 	spin_unlock_irqrestore(&local->sta_lock, flags);
 }
 
-static inline int sta_info_buffer_expired(struct ieee80211_local *local,
-					  struct sta_info *sta,
-					  struct sk_buff *skb)
+static int sta_info_buffer_expired(struct sta_info *sta,
+				   struct sk_buff *skb)
 {
 	struct ieee80211_tx_info *info;
 	int timeout;
@@ -520,8 +569,9 @@ static inline int sta_info_buffer_expired(struct ieee80211_local *local,
 	info = IEEE80211_SKB_CB(skb);
 
 	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
-	timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
-		   15625) * HZ;
+	timeout = (sta->listen_interval *
+		   sta->sdata->vif.bss_conf.beacon_int *
+		   32 / 15625) * HZ;
 	if (timeout < STA_TX_BUFFER_EXPIRE)
 		timeout = STA_TX_BUFFER_EXPIRE;
 	return time_after(jiffies, info->control.jiffies + timeout);
@@ -534,7 +584,6 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 	unsigned long flags;
 	struct sk_buff *skb;
 	struct ieee80211_sub_if_data *sdata;
-	DECLARE_MAC_BUF(mac);
 
 	if (skb_queue_empty(&sta->ps_tx_buf))
 		return;
@@ -542,7 +591,7 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 	for (;;) {
 		spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
 		skb = skb_peek(&sta->ps_tx_buf);
-		if (sta_info_buffer_expired(local, sta, skb))
+		if (sta_info_buffer_expired(sta, skb))
 			skb = __skb_dequeue(&sta->ps_tx_buf);
 		else
 			skb = NULL;
@@ -553,8 +602,10 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 
 		sdata = sta->sdata;
 		local->total_ps_buffered--;
-		printk(KERN_DEBUG "Buffered frame expired (STA "
-		       "%s)\n", print_mac(mac, sta->addr));
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+		printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
+		       sta->sta.addr);
+#endif
 		dev_kfree_skb(skb);
 
 		if (skb_queue_empty(&sta->ps_tx_buf))
@@ -573,6 +624,9 @@ static void sta_info_cleanup(unsigned long data)
 		sta_info_cleanup_expire_buffered(local, sta);
 	rcu_read_unlock();
 
+	if (local->quiescing)
+		return;
+
 	local->sta_cleanup.expires =
 		round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
 	add_timer(&local->sta_cleanup);
@@ -623,7 +677,12 @@ static void sta_info_debugfs_add_work(struct work_struct *work)
 
 		spin_lock_irqsave(&local->sta_lock, flags);
 		list_for_each_entry(tmp, &local->sta_list, list) {
-			if (!tmp->debugfs.dir) {
+			/*
+			 * debugfs.add_has_run will be set by
+			 * ieee80211_sta_debugfs_add regardless
+			 * of what else it does.
+			 */
+			if (!tmp->debugfs.add_has_run) {
 				sta = tmp;
 				__sta_info_pin(sta);
 				break;
@@ -644,41 +703,10 @@ static void sta_info_debugfs_add_work(struct work_struct *work)
 }
 #endif
 
-static void __ieee80211_run_pending_flush(struct ieee80211_local *local)
-{
-	struct sta_info *sta;
-	unsigned long flags;
-
-	ASSERT_RTNL();
-
-	spin_lock_irqsave(&local->sta_lock, flags);
-	while (!list_empty(&local->sta_flush_list)) {
-		sta = list_first_entry(&local->sta_flush_list,
-				       struct sta_info, list);
-		list_del(&sta->list);
-		spin_unlock_irqrestore(&local->sta_lock, flags);
-		sta_info_destroy(sta);
-		spin_lock_irqsave(&local->sta_lock, flags);
-	}
-	spin_unlock_irqrestore(&local->sta_lock, flags);
-}
-
-static void ieee80211_sta_flush_work(struct work_struct *work)
-{
-	struct ieee80211_local *local =
-		container_of(work, struct ieee80211_local, sta_flush_work);
-
-	rtnl_lock();
-	__ieee80211_run_pending_flush(local);
-	rtnl_unlock();
-}
-
 void sta_info_init(struct ieee80211_local *local)
 {
 	spin_lock_init(&local->sta_lock);
 	INIT_LIST_HEAD(&local->sta_list);
-	INIT_LIST_HEAD(&local->sta_flush_list);
-	INIT_WORK(&local->sta_flush_work, ieee80211_sta_flush_work);
 
 	setup_timer(&local->sta_cleanup, sta_info_cleanup,
 		    (unsigned long)local);
@@ -699,7 +727,6 @@ int sta_info_start(struct ieee80211_local *local)
 void sta_info_stop(struct ieee80211_local *local)
 {
 	del_timer(&local->sta_cleanup);
-	cancel_work_sync(&local->sta_flush_work);
 #ifdef CONFIG_MAC80211_DEBUGFS
 	/*
 	 * Make sure the debugfs adding work isn't pending after this
@@ -710,10 +737,7 @@ void sta_info_stop(struct ieee80211_local *local)
 	cancel_work_sync(&local->sta_debugfs_add);
 #endif
 
-	rtnl_lock();
 	sta_info_flush(local, NULL);
-	__ieee80211_run_pending_flush(local);
-	rtnl_unlock();
 }
 
 /**
@@ -725,7 +749,7 @@ void sta_info_stop(struct ieee80211_local *local)
  * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
  */
 int sta_info_flush(struct ieee80211_local *local,
-		    struct ieee80211_sub_if_data *sdata)
+		   struct ieee80211_sub_if_data *sdata)
 {
 	struct sta_info *sta, *tmp;
 	LIST_HEAD(tmp_list);
@@ -733,7 +757,6 @@ int sta_info_flush(struct ieee80211_local *local,
 	unsigned long flags;
 
 	might_sleep();
-	ASSERT_RTNL();
 
 	spin_lock_irqsave(&local->sta_lock, flags);
 	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
@@ -753,35 +776,38 @@ int sta_info_flush(struct ieee80211_local *local,
 	return ret;
 }
 
-/**
- * sta_info_flush_delayed - flush matching STA entries from the STA table
- *
- * This function unlinks all stations for a given interface and queues
- * them for freeing. Note that the workqueue function scheduled here has
- * to run before any new keys can be added to the system to avoid set_key()
- * callback ordering issues.
- *
- * @sdata: the interface
- */
-void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata)
+void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
+			  unsigned long exp_time)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct sta_info *sta, *tmp;
+	LIST_HEAD(tmp_list);
 	unsigned long flags;
-	bool work = false;
 
 	spin_lock_irqsave(&local->sta_lock, flags);
-	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
-		if (sdata == sta->sdata) {
+	list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
+		if (time_after(jiffies, sta->last_rx + exp_time)) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+			printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
+			       sdata->dev->name, sta->sta.addr);
+#endif
 			__sta_info_unlink(&sta);
-			if (sta) {
-				list_add_tail(&sta->list,
-					      &local->sta_flush_list);
-				work = true;
-			}
+			if (sta)
+				list_add(&sta->list, &tmp_list);
 		}
-	}
-	if (work)
-		schedule_work(&local->sta_flush_work);
 	spin_unlock_irqrestore(&local->sta_lock, flags);
+
+	list_for_each_entry_safe(sta, tmp, &tmp_list, list)
+		sta_info_destroy(sta);
+}
+
+struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
+					 const u8 *addr)
+{
+	struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
+
+	if (!sta)
+		return NULL;
+	return &sta->sta;
 }
+EXPORT_SYMBOL(ieee80211_find_sta);