X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fmac80211%2Fsta_info.c;h=10c5539c20abdcafdd8fc1461914b2b9b43ba3ff;hb=76a67ec6fb79ff3570dcb5342142c16098299911;hp=2a5a2f067bae044815cd5c1e91152b7b516261fe;hpb=97bff8ecf4e4e26749a67dcfbb7565d8a0f4acb4;p=safe%2Fjmp%2Flinux-2.6

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 2a5a2f0..10c5539 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -19,7 +19,7 @@
 
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
-#include "ieee80211_rate.h"
+#include "rate.h"
 #include "sta_info.h"
 #include "debugfs_sta.h"
 #include "mesh.h"
@@ -36,25 +36,30 @@
  * (which is pretty useless) or insert it into the hash table using
  * sta_info_insert() which demotes the reference from ownership to a regular
  * RCU-protected reference; if the function is called without protection by an
- * RCU critical section the reference is instantly invalidated.
+ * RCU critical section the reference is instantly invalidated. Note that the
+ * caller may not do much with the STA info before inserting it, in particular,
+ * it may not start any mesh peer link management or add encryption keys.
+ *
+ * When the insertion fails (sta_info_insert()) returns non-zero), the
+ * structure will have been freed by sta_info_insert()!
  *
  * 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.
- * See the comment in __sta_info_unlink() for more information.
+ * See the comment in __sta_info_unlink() for more information, this is
+ * an internal capability only.
  *
  * In order to remove a STA info structure, the caller needs to first
  * unlink it (sta_info_unlink()) from the list and hash tables and
- * then wait for an RCU synchronisation before it can be freed. Due to
- * the pinning and the possibility of multiple callers trying to remove
- * the same STA info at the same time, sta_info_unlink() can clear the
- * STA info pointer it is passed to indicate that the STA info is owned
- * by somebody else now.
+ * then destroy it; sta_info_destroy() will wait for an RCU grace period
+ * to elapse before actually freeing it. Due to the pinning and the
+ * possibility of multiple callers trying to remove the same STA info at
+ * the same time, sta_info_unlink() can clear the STA info pointer it is
+ * passed to indicate that the STA info is owned by somebody else now.
  *
  * If sta_info_unlink() did not clear the pointer then the caller owns
  * the STA info structure now and is responsible of destroying it with
- * a call to sta_info_destroy(), not before RCU synchronisation, of
- * course. Note that sta_info_destroy() must be protected by the RTNL.
+ * a call to sta_info_destroy().
  *
  * In all other cases, there is no concept of ownership on a STA entry,
  * each structure is owned by the global hash table/list until it is
@@ -68,11 +73,11 @@ 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;
 	}
@@ -88,26 +93,19 @@ 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)
 {
@@ -127,14 +125,35 @@ struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
 	return NULL;
 }
 
+/**
+ * __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()
+ * that may happen before sta_info_insert().
+ */
+static void __sta_info_free(struct ieee80211_local *local,
+			    struct sta_info *sta)
+{
+	rate_control_free_sta(sta);
+	rate_control_put(sta->rate_ctrl);
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+	printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
+	       wiphy_name(local->hw.wiphy), sta->sta.addr);
+#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
+
+	kfree(sta);
+}
+
 void sta_info_destroy(struct sta_info *sta)
 {
 	struct ieee80211_local *local;
 	struct sk_buff *skb;
 	int i;
-	DECLARE_MAC_BUF(mbuf);
 
-	ASSERT_RTNL();
 	might_sleep();
 
 	if (!sta)
@@ -151,12 +170,15 @@ void sta_info_destroy(struct sta_info *sta)
 #endif
 
 	/*
-	 * NOTE: This will call synchronize_rcu() internally to
-	 * make sure no key references can be in use. We rely on
-	 * that here for the mesh code!
+	 * We have only unlinked the key, and actually destroying it
+	 * may mean it is removed from hardware which requires that
+	 * the key->sta pointer is still valid, so flush the key todo
+	 * list here.
+	 *
+	 * ieee80211_key_todo() will synchronize_rcu() so after this
+	 * nothing can reference this sta struct any more.
 	 */
-	ieee80211_key_free(sta->key);
-	WARN_ON(sta->key);
+	ieee80211_key_todo();
 
 #ifdef CONFIG_MAC80211_MESH
 	if (ieee80211_vif_is_mesh(&sta->sdata->vif))
@@ -172,25 +194,15 @@ void sta_info_destroy(struct sta_info *sta)
 		dev_kfree_skb_any(skb);
 
 	for (i = 0; i <  STA_TID_NUM; i++) {
-		spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
+		spin_lock_bh(&sta->lock);
 		if (sta->ampdu_mlme.tid_rx[i])
 		  del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer);
-		spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
-		spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 		if (sta->ampdu_mlme.tid_tx[i])
 		  del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer);
-		spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+		spin_unlock_bh(&sta->lock);
 	}
 
-	rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
-	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));
-#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
-
-	kfree(sta);
+	__sta_info_free(local, sta);
 }
 
 
@@ -198,8 +210,8 @@ 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,
@@ -208,34 +220,34 @@ 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;
 
-	memcpy(sta->addr, addr, ETH_ALEN);
+	spin_lock_init(&sta->lock);
+	spin_lock_init(&sta->flaglock);
+
+	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);
 		return NULL;
 	}
 
-	spin_lock_init(&sta->ampdu_mlme.ampdu_rx);
-	spin_lock_init(&sta->ampdu_mlme.ampdu_tx);
 	for (i = 0; i < STA_TID_NUM; i++) {
 		/* timer_to_tid must be initialized with identity mapping to
 		 * 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] = local->hw.queues;
+		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;
@@ -248,13 +260,12 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 	skb_queue_head_init(&sta->tx_filtered);
 
 #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
 	sta->plink_state = PLINK_LISTEN;
-	spin_lock_init(&sta->plink_lock);
 	init_timer(&sta->plink_timer);
 #endif
 
@@ -266,27 +277,30 @@ int sta_info_insert(struct sta_info *sta)
 	struct ieee80211_local *local = sta->local;
 	struct ieee80211_sub_if_data *sdata = sta->sdata;
 	unsigned long flags;
-	DECLARE_MAC_BUF(mac);
+	int err = 0;
 
 	/*
 	 * Can't be a WARN_ON because it can be triggered through a race:
 	 * something inserts a STA (on one CPU) without holding the RTNL
 	 * and another CPU turns off the net device.
 	 */
-	if (unlikely(!netif_running(sdata->dev)))
-		return -ENETDOWN;
-
-	if (WARN_ON(compare_ether_addr(sta->addr, sdata->dev->dev_addr) == 0))
-		return -EINVAL;
+	if (unlikely(!netif_running(sdata->dev))) {
+		err = -ENETDOWN;
+		goto out_free;
+	}
 
-	if (WARN_ON(is_multicast_ether_addr(sta->addr)))
-		return -EINVAL;
+	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);
-		return -EEXIST;
+		err = -EEXIST;
+		goto out_free;
 	}
 	list_add(&sta->list, &local->sta_list);
 	local->num_sta++;
@@ -294,31 +308,41 @@ int sta_info_insert(struct sta_info *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);
+				       STA_NOTIFY_ADD, &sta->sta);
 	}
 
 #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);
 
 #ifdef CONFIG_MAC80211_DEBUGFS
-	/* debugfs entry adding might sleep, so schedule process
+	/*
+	 * Debugfs entry adding might sleep, so schedule process
 	 * context task for adding entry for STAs that do not yet
-	 * have one. */
-	queue_work(local->hw.workqueue, &local->sta_debugfs_add);
+	 * have one.
+	 * NOTE: due to auto-freeing semantics this may only be done
+	 *       if the insertion is successful!
+	 */
+	schedule_work(&local->sta_debugfs_add);
 #endif
 
 	if (ieee80211_vif_is_mesh(&sdata->vif))
 		mesh_accept_plinks_update(sdata);
 
 	return 0;
+ out_free:
+	BUG_ON(!err);
+	__sta_info_free(local, sta);
+	return err;
 }
 
 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
@@ -342,11 +366,14 @@ 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);
+		sta->local->ops->set_tim(local_to_hw(sta->local),
+					 &sta->sta, true);
 		sta->local->tim_in_locked_section = false;
 	}
 }
@@ -355,6 +382,8 @@ 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);
@@ -363,11 +392,14 @@ 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);
+		sta->local->ops->set_tim(local_to_hw(sta->local),
+					 &sta->sta, false);
 		sta->local->tim_in_locked_section = false;
 	}
 }
@@ -376,48 +408,17 @@ void sta_info_clear_tim_bit(struct sta_info *sta)
 {
 	unsigned long flags;
 
-	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);
-}
-
-/*
- * See comment in __sta_info_unlink,
- * caller must hold local->sta_lock.
- */
-static void __sta_info_pin(struct sta_info *sta)
-{
-	WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
-	sta->pin_status = STA_INFO_PIN_STAT_PINNED;
-}
-
-/*
- * See comment in __sta_info_unlink, returns sta if it
- * needs to be destroyed.
- */
-static struct sta_info *__sta_info_unpin(struct sta_info *sta)
-{
-	struct sta_info *ret = NULL;
-	unsigned long flags;
+	BUG_ON(!sta->sdata->bss);
 
 	spin_lock_irqsave(&sta->local->sta_lock, flags);
-	WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
-		sta->pin_status != STA_INFO_PIN_STAT_PINNED);
-	if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
-		ret = sta;
-	sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
+	__sta_info_clear_tim_bit(sta->sdata->bss, sta);
 	spin_unlock_irqrestore(&sta->local->sta_lock, flags);
-
-	return ret;
 }
 
 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.
 	 */
@@ -426,50 +427,30 @@ static void __sta_info_unlink(struct sta_info **sta)
 		return;
 	}
 
-	/*
-	 * Also pull caller's reference if the STA is pinned by the
-	 * task that is adding the debugfs entries. In that case, we
-	 * leave the STA "to be freed".
-	 *
-	 * The rules are not trivial, but not too complex either:
-	 *  (1) pin_status is only modified under the sta_lock
-	 *  (2) sta_info_debugfs_add_work() will set the status
-	 *	to PINNED when it found an item that needs a new
-	 *	debugfs directory created. In that case, that item
-	 *	must not be freed although all *RCU* users are done
-	 *	with it. Hence, we tell the caller of _unlink()
-	 *	that the item is already gone (as can happen when
-	 *	two tasks try to unlink/destroy at the same time)
-	 *  (3) We set the pin_status to DESTROY here when we
-	 *	find such an item.
-	 *  (4) sta_info_debugfs_add_work() will reset the pin_status
-	 *	from PINNED to NORMAL when it is done with the item,
-	 *	but will check for DESTROY before resetting it in
-	 *	which case it will free the item.
-	 */
-	if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
-		(*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
-		*sta = NULL;
-		return;
+	if ((*sta)->key) {
+		ieee80211_key_free((*sta)->key);
+		WARN_ON((*sta)->key);
 	}
 
 	list_del(&(*sta)->list);
 
-	if ((*sta)->flags & WLAN_STA_PS) {
-		(*sta)->flags &= ~WLAN_STA_PS;
-		if (sdata->bss)
-			atomic_dec(&sdata->bss->num_sta_ps);
+	if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
+		BUG_ON(!sdata->bss);
+
+		atomic_dec(&sdata->bss->num_sta_ps);
 		__sta_info_clear_tim_bit(sdata->bss, *sta);
 	}
 
 	local->num_sta--;
 
 	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_REMOVE, (*sta)->addr);
+				       STA_NOTIFY_REMOVE, &(*sta)->sta);
 	}
 
 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
@@ -480,9 +461,43 @@ static 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 */
+
+	/*
+	 * Finally, pull caller's reference if the STA is pinned by the
+	 * task that is adding the debugfs entries. In that case, we
+	 * leave the STA "to be freed".
+	 *
+	 * The rules are not trivial, but not too complex either:
+	 *  (1) pin_status is only modified under the sta_lock
+	 *  (2) STAs may only be pinned under the RTNL so that
+	 *	sta_info_flush() is guaranteed to actually destroy
+	 *	all STAs that are active for a given interface, this
+	 *	is required for correctness because otherwise we
+	 *	could notify a driver that an interface is going
+	 *	away and only after that (!) notify it about a STA
+	 *	on that interface going away.
+	 *  (3) sta_info_debugfs_add_work() will set the status
+	 *	to PINNED when it found an item that needs a new
+	 *	debugfs directory created. In that case, that item
+	 *	must not be freed although all *RCU* users are done
+	 *	with it. Hence, we tell the caller of _unlink()
+	 *	that the item is already gone (as can happen when
+	 *	two tasks try to unlink/destroy at the same time)
+	 *  (4) We set the pin_status to DESTROY here when we
+	 *	find such an item.
+	 *  (5) sta_info_debugfs_add_work() will reset the pin_status
+	 *	from PINNED to NORMAL when it is done with the item,
+	 *	but will check for DESTROY before resetting it in
+	 *	which case it will free the item.
+	 */
+	if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
+		(*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
+		*sta = NULL;
+		return;
+	}
 }
 
 void sta_info_unlink(struct sta_info **sta)
@@ -499,20 +514,20 @@ static inline int sta_info_buffer_expired(struct ieee80211_local *local,
 					  struct sta_info *sta,
 					  struct sk_buff *skb)
 {
-	struct ieee80211_tx_packet_data *pkt_data;
+	struct ieee80211_tx_info *info;
 	int timeout;
 
 	if (!skb)
 		return 0;
 
-	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
+	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;
 	if (timeout < STA_TX_BUFFER_EXPIRE)
 		timeout = STA_TX_BUFFER_EXPIRE;
-	return time_after(jiffies, pkt_data->jiffies + timeout);
+	return time_after(jiffies, info->control.jiffies + timeout);
 }
 
 
@@ -522,7 +537,6 @@ 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;
@@ -541,8 +555,10 @@ 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))
@@ -567,6 +583,36 @@ static void sta_info_cleanup(unsigned long data)
 }
 
 #ifdef CONFIG_MAC80211_DEBUGFS
+/*
+ * See comment in __sta_info_unlink,
+ * caller must hold local->sta_lock.
+ */
+static void __sta_info_pin(struct sta_info *sta)
+{
+	WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
+	sta->pin_status = STA_INFO_PIN_STAT_PINNED;
+}
+
+/*
+ * See comment in __sta_info_unlink, returns sta if it
+ * needs to be destroyed.
+ */
+static struct sta_info *__sta_info_unpin(struct sta_info *sta)
+{
+	struct sta_info *ret = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sta->local->sta_lock, flags);
+	WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
+		sta->pin_status != STA_INFO_PIN_STAT_PINNED);
+	if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
+		ret = sta;
+	sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
+	spin_unlock_irqrestore(&sta->local->sta_lock, flags);
+
+	return ret;
+}
+
 static void sta_info_debugfs_add_work(struct work_struct *work)
 {
 	struct ieee80211_local *local =
@@ -574,12 +620,19 @@ static void sta_info_debugfs_add_work(struct work_struct *work)
 	struct sta_info *sta, *tmp;
 	unsigned long flags;
 
+	/* We need to keep the RTNL across the whole pinned status. */
+	rtnl_lock();
 	while (1) {
 		sta = NULL;
 
 		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;
@@ -594,19 +647,47 @@ static void sta_info_debugfs_add_work(struct work_struct *work)
 		rate_control_add_sta_debugfs(sta);
 
 		sta = __sta_info_unpin(sta);
-
-		if (sta) {
-			synchronize_rcu();
-			sta_info_destroy(sta);
-		}
+		sta_info_destroy(sta);
 	}
+	rtnl_unlock();
 }
 #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);
@@ -627,7 +708,21 @@ 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
+	 * because we're about to be destroyed. It doesn't matter
+	 * whether it ran or not since we're going to flush all STAs
+	 * anyway.
+	 */
+	cancel_work_sync(&local->sta_debugfs_add);
+#endif
+
+	rtnl_lock();
 	sta_info_flush(local, NULL);
+	__ieee80211_run_pending_flush(local);
+	rtnl_unlock();
 }
 
 /**
@@ -647,6 +742,7 @@ 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) {
@@ -660,10 +756,77 @@ int sta_info_flush(struct ieee80211_local *local,
 	}
 	spin_unlock_irqrestore(&local->sta_lock, flags);
 
-	synchronize_rcu();
-
 	list_for_each_entry_safe(sta, tmp, &tmp_list, list)
 		sta_info_destroy(sta);
 
 	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)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sta_info *sta, *tmp;
+	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) {
+			__sta_info_unlink(&sta);
+			if (sta) {
+				list_add_tail(&sta->list,
+					      &local->sta_flush_list);
+				work = true;
+			}
+		}
+	}
+	if (work)
+		schedule_work(&local->sta_flush_work);
+	spin_unlock_irqrestore(&local->sta_lock, flags);
+}
+
+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;
+
+	spin_lock_irqsave(&local->sta_lock, flags);
+	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(&sta->list, &tmp_list);
+		}
+	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);