[linux-2.6-block.git] / net / mac80211 / sta_info.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/timer.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "sta_info.h"
#include "debugfs_sta.h"

/* Caller must hold local->sta_lock */
static void sta_info_hash_add(struct ieee80211_local *local,
			      struct sta_info *sta)
{
	sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
	local->sta_hash[STA_HASH(sta->addr)] = sta;
}


/* Caller must hold local->sta_lock */
static int sta_info_hash_del(struct ieee80211_local *local,
			     struct sta_info *sta)
{
	struct sta_info *s;

	s = local->sta_hash[STA_HASH(sta->addr)];
	if (!s)
		return -ENOENT;
	if (s == sta) {
		local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
		return 0;
	}

	while (s->hnext && s->hnext != sta)
		s = s->hnext;
	if (s->hnext) {
		s->hnext = sta->hnext;
		return 0;
	}

	return -ENOENT;
}

struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
{
	struct sta_info *sta;

	read_lock_bh(&local->sta_lock);
	sta = local->sta_hash[STA_HASH(addr)];
	while (sta) {
		if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
			__sta_info_get(sta);
			break;
		}
		sta = sta->hnext;
	}
	read_unlock_bh(&local->sta_lock);

	return sta;
}
EXPORT_SYMBOL(sta_info_get);

int sta_info_min_txrate_get(struct ieee80211_local *local)
{
	struct sta_info *sta;
	struct ieee80211_hw_mode *mode;
	int min_txrate = 9999999;
	int i;

	read_lock_bh(&local->sta_lock);
	mode = local->oper_hw_mode;
	for (i = 0; i < STA_HASH_SIZE; i++) {
		sta = local->sta_hash[i];
		while (sta) {
			if (sta->txrate < min_txrate)
				min_txrate = sta->txrate;
			sta = sta->hnext;
		}
	}
	read_unlock_bh(&local->sta_lock);
	if (min_txrate == 9999999)
		min_txrate = 0;

	return mode->rates[min_txrate].rate;
}


static void sta_info_release(struct kref *kref)
{
	struct sta_info *sta = container_of(kref, struct sta_info, kref);
	struct ieee80211_local *local = sta->local;
	struct sk_buff *skb;

	/* free sta structure; it has already been removed from
	 * hash table etc. external structures. Make sure that all
	 * buffered frames are release (one might have been added
	 * after sta_info_free() was called). */
	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
		local->total_ps_buffered--;
		dev_kfree_skb_any(skb);
	}
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
		dev_kfree_skb_any(skb);
	}
	rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
	rate_control_put(sta->rate_ctrl);
	kfree(sta);
}


void sta_info_put(struct sta_info *sta)
{
	kref_put(&sta->kref, sta_info_release);
}
EXPORT_SYMBOL(sta_info_put);


struct sta_info * sta_info_add(struct ieee80211_local *local,
			       struct net_device *dev, u8 *addr, gfp_t gfp)
{
	struct sta_info *sta;
	DECLARE_MAC_BUF(mac);

	sta = kzalloc(sizeof(*sta), gfp);
	if (!sta)
		return NULL;

	kref_init(&sta->kref);

	sta->rate_ctrl = rate_control_get(local->rate_ctrl);
	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
	if (!sta->rate_ctrl_priv) {
		rate_control_put(sta->rate_ctrl);
		kfree(sta);
		return NULL;
	}

	memcpy(sta->addr, addr, ETH_ALEN);
	sta->local = local;
	sta->dev = dev;
	skb_queue_head_init(&sta->ps_tx_buf);
	skb_queue_head_init(&sta->tx_filtered);
	__sta_info_get(sta);	/* sta used by caller, decremented by
				 * sta_info_put() */
	write_lock_bh(&local->sta_lock);
	list_add(&sta->list, &local->sta_list);
	local->num_sta++;
	sta_info_hash_add(local, sta);
	if (local->ops->sta_notify)
		local->ops->sta_notify(local_to_hw(local), dev->ifindex,
					STA_NOTIFY_ADD, addr);
	write_unlock_bh(&local->sta_lock);

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	printk(KERN_DEBUG "%s: Added STA %s\n",
	       wiphy_name(local->hw.wiphy), print_mac(mac, addr));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */

#ifdef CONFIG_MAC80211_DEBUGFS
	/* 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);
#endif

	return sta;
}

/* Caller must hold local->sta_lock */
void sta_info_remove(struct sta_info *sta)
{
	struct ieee80211_local *local = sta->local;
	struct ieee80211_sub_if_data *sdata;

	/* don't do anything if we've been removed already */
	if (sta_info_hash_del(local, sta))
		return;

	list_del(&sta->list);
	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	if (sta->flags & WLAN_STA_PS) {
		sta->flags &= ~WLAN_STA_PS;
		if (sdata->bss)
			atomic_dec(&sdata->bss->num_sta_ps);
	}
	local->num_sta--;
	sta_info_remove_aid_ptr(sta);

}

void sta_info_free(struct sta_info *sta)
{
	struct sk_buff *skb;
	struct ieee80211_local *local = sta->local;
	DECLARE_MAC_BUF(mac);

	might_sleep();

	write_lock_bh(&local->sta_lock);
	sta_info_remove(sta);
	write_unlock_bh(&local->sta_lock);

	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
		local->total_ps_buffered--;
		dev_kfree_skb(skb);
	}
	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
		dev_kfree_skb(skb);
	}

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
	printk(KERN_DEBUG "%s: Removed STA %s\n",
	       wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */

	ieee80211_key_free(sta->key);
	sta->key = NULL;

	if (local->ops->sta_notify)
		local->ops->sta_notify(local_to_hw(local), sta->dev->ifindex,
					STA_NOTIFY_REMOVE, sta->addr);

	rate_control_remove_sta_debugfs(sta);
	ieee80211_sta_debugfs_remove(sta);

	sta_info_put(sta);
}


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;
	int timeout;

	if (!skb)
		return 0;

	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;

	/* 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);
}


static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
					     struct sta_info *sta)
{
	unsigned long flags;
	struct sk_buff *skb;
	DECLARE_MAC_BUF(mac);

	if (skb_queue_empty(&sta->ps_tx_buf))
		return;

	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)) {
			skb = __skb_dequeue(&sta->ps_tx_buf);
			if (skb_queue_empty(&sta->ps_tx_buf))
				sta->flags &= ~WLAN_STA_TIM;
		} else
			skb = NULL;
		spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);

		if (skb) {
			local->total_ps_buffered--;
			printk(KERN_DEBUG "Buffered frame expired (STA "
			       "%s)\n", print_mac(mac, sta->addr));
			dev_kfree_skb(skb);
		} else
			break;
	}
}


static void sta_info_cleanup(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *) data;
	struct sta_info *sta;

	read_lock_bh(&local->sta_lock);
	list_for_each_entry(sta, &local->sta_list, list) {
		__sta_info_get(sta);
		sta_info_cleanup_expire_buffered(local, sta);
		sta_info_put(sta);
	}
	read_unlock_bh(&local->sta_lock);

	local->sta_cleanup.expires =
		round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
	add_timer(&local->sta_cleanup);
}

#ifdef CONFIG_MAC80211_DEBUGFS
static void sta_info_debugfs_add_task(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, sta_debugfs_add);
	struct sta_info *sta, *tmp;

	while (1) {
		sta = NULL;
		read_lock_bh(&local->sta_lock);
		list_for_each_entry(tmp, &local->sta_list, list) {
			if (!tmp->debugfs.dir) {
				sta = tmp;
				__sta_info_get(sta);
				break;
			}
		}
		read_unlock_bh(&local->sta_lock);

		if (!sta)
			break;

		ieee80211_sta_debugfs_add(sta);
		rate_control_add_sta_debugfs(sta);
		sta_info_put(sta);
	}
}
#endif

void sta_info_init(struct ieee80211_local *local)
{
	rwlock_init(&local->sta_lock);
	INIT_LIST_HEAD(&local->sta_list);

	setup_timer(&local->sta_cleanup, sta_info_cleanup,
		    (unsigned long)local);
	local->sta_cleanup.expires =
		round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);

#ifdef CONFIG_MAC80211_DEBUGFS
	INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
#endif
}

int sta_info_start(struct ieee80211_local *local)
{
	add_timer(&local->sta_cleanup);
	return 0;
}

void sta_info_stop(struct ieee80211_local *local)
{
	del_timer(&local->sta_cleanup);
	sta_info_flush(local, NULL);
}

void sta_info_remove_aid_ptr(struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;

	if (sta->aid <= 0)
		return;

	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);

	if (sdata->local->ops->set_tim)
		sdata->local->ops->set_tim(local_to_hw(sdata->local),
					  sta->aid, 0);
	if (sdata->bss)
		__bss_tim_clear(sdata->bss, sta->aid);
}


/**
 * sta_info_flush - flush matching STA entries from the STA table
 * @local: local interface data
 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
 */
void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
{
	struct sta_info *sta, *tmp;
	LIST_HEAD(tmp_list);

	write_lock_bh(&local->sta_lock);
	list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
		if (!dev || dev == sta->dev) {
			__sta_info_get(sta);
			sta_info_remove(sta);
			list_add_tail(&sta->list, &tmp_list);
		}
	write_unlock_bh(&local->sta_lock);

	list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
		sta_info_free(sta);
		sta_info_put(sta);
	}
}
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Copyright 2002-2005, Instant802 Networks, Inc.
	3	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	4	*
	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	*/
	9
	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>
0d174406	17	#include <linux/timer.h>
f0706e82 JB	18
	19	#include <net/mac80211.h>
	20	#include "ieee80211_i.h"
	21	#include "ieee80211_rate.h"
	22	#include "sta_info.h"
e9f207f0	23	#include "debugfs_sta.h"
f0706e82 JB	24
	25	/* Caller must hold local->sta_lock */
	26	static void sta_info_hash_add(struct ieee80211_local *local,
	27	struct sta_info *sta)
	28	{
	29	sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
	30	local->sta_hash[STA_HASH(sta->addr)] = sta;
	31	}
	32
	33
	34	/* Caller must hold local->sta_lock */
be8755e1 MW	35	static int sta_info_hash_del(struct ieee80211_local *local,
be8755e1 MW	36	struct sta_info *sta)
f0706e82 JB	37	{
	38	struct sta_info *s;
	39
	40	s = local->sta_hash[STA_HASH(sta->addr)];
	41	if (!s)
be8755e1 MW	42	return -ENOENT;
be8755e1 MW	43	if (s == sta) {
f0706e82	44	local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
be8755e1	45	return 0;
f0706e82 JB	46	}
f0706e82 JB	47
be8755e1	48	while (s->hnext && s->hnext != sta)
f0706e82	49	s = s->hnext;
be8755e1 MW	50	if (s->hnext) {
	51	s->hnext = sta->hnext;
	52	return 0;
	53	}
f0706e82	54
be8755e1	55	return -ENOENT;
f0706e82 JB	56	}
	57
	58	struct sta_info sta_info_get(struct ieee80211_local local, u8 *addr)
	59	{
	60	struct sta_info *sta;
	61
be8755e1	62	read_lock_bh(&local->sta_lock);
f0706e82 JB	63	sta = local->sta_hash[STA_HASH(addr)];
	64	while (sta) {
	65	if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
	66	__sta_info_get(sta);
	67	break;
	68	}
	69	sta = sta->hnext;
	70	}
be8755e1	71	read_unlock_bh(&local->sta_lock);
f0706e82 JB	72
	73	return sta;
	74	}
	75	EXPORT_SYMBOL(sta_info_get);
	76
	77	int sta_info_min_txrate_get(struct ieee80211_local *local)
	78	{
	79	struct sta_info *sta;
	80	struct ieee80211_hw_mode *mode;
	81	int min_txrate = 9999999;
	82	int i;
	83
be8755e1	84	read_lock_bh(&local->sta_lock);
f0706e82 JB	85	mode = local->oper_hw_mode;
	86	for (i = 0; i < STA_HASH_SIZE; i++) {
	87	sta = local->sta_hash[i];
	88	while (sta) {
	89	if (sta->txrate < min_txrate)
	90	min_txrate = sta->txrate;
	91	sta = sta->hnext;
	92	}
	93	}
be8755e1	94	read_unlock_bh(&local->sta_lock);
f0706e82 JB	95	if (min_txrate == 9999999)
	96	min_txrate = 0;
	97
	98	return mode->rates[min_txrate].rate;
	99	}
	100
	101
	102	static void sta_info_release(struct kref *kref)
	103	{
	104	struct sta_info *sta = container_of(kref, struct sta_info, kref);
	105	struct ieee80211_local *local = sta->local;
	106	struct sk_buff *skb;
	107
	108	/* free sta structure; it has already been removed from
	109	* hash table etc. external structures. Make sure that all
	110	* buffered frames are release (one might have been added
	111	* after sta_info_free() was called). */
	112	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
	113	local->total_ps_buffered--;
	114	dev_kfree_skb_any(skb);
	115	}
	116	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
	117	dev_kfree_skb_any(skb);
	118	}
	119	rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
	120	rate_control_put(sta->rate_ctrl);
	121	kfree(sta);
	122	}
	123
	124
	125	void sta_info_put(struct sta_info *sta)
	126	{
	127	kref_put(&sta->kref, sta_info_release);
	128	}
	129	EXPORT_SYMBOL(sta_info_put);
	130
	131
	132	struct sta_info * sta_info_add(struct ieee80211_local *local,
	133	struct net_device dev, u8 addr, gfp_t gfp)
	134	{
	135	struct sta_info *sta;
0795af57	136	DECLARE_MAC_BUF(mac);
f0706e82 JB	137
	138	sta = kzalloc(sizeof(*sta), gfp);
	139	if (!sta)
	140	return NULL;
	141
	142	kref_init(&sta->kref);
	143
	144	sta->rate_ctrl = rate_control_get(local->rate_ctrl);
	145	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
	146	if (!sta->rate_ctrl_priv) {
	147	rate_control_put(sta->rate_ctrl);
f0706e82 JB	148	kfree(sta);
	149	return NULL;
	150	}
	151
	152	memcpy(sta->addr, addr, ETH_ALEN);
	153	sta->local = local;
	154	sta->dev = dev;
	155	skb_queue_head_init(&sta->ps_tx_buf);
	156	skb_queue_head_init(&sta->tx_filtered);
	157	__sta_info_get(sta); /* sta used by caller, decremented by
	158	* sta_info_put() */
be8755e1	159	write_lock_bh(&local->sta_lock);
f0706e82 JB	160	list_add(&sta->list, &local->sta_list);
	161	local->num_sta++;
	162	sta_info_hash_add(local, sta);
478f8d2b TW	163	if (local->ops->sta_notify)
	164	local->ops->sta_notify(local_to_hw(local), dev->ifindex,
	165	STA_NOTIFY_ADD, addr);
be8755e1	166	write_unlock_bh(&local->sta_lock);
f0706e82 JB	167
f0706e82 JB	168	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0795af57	169	printk(KERN_DEBUG "%s: Added STA %s\n",
dd1cd4c6	170	wiphy_name(local->hw.wiphy), print_mac(mac, addr));
f0706e82 JB	171	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
f0706e82 JB	172
e9f207f0	173	#ifdef CONFIG_MAC80211_DEBUGFS
be8755e1 MW	174	/* debugfs entry adding might sleep, so schedule process
	175	* context task for adding entry for STAs that do not yet
	176	* have one. */
	177	queue_work(local->hw.workqueue, &local->sta_debugfs_add);
e9f207f0 JB	178	#endif
e9f207f0 JB	179
f0706e82 JB	180	return sta;
	181	}
	182
be8755e1 MW	183	/* Caller must hold local->sta_lock */
be8755e1 MW	184	void sta_info_remove(struct sta_info *sta)
f0706e82 JB	185	{
	186	struct ieee80211_local *local = sta->local;
	187	struct ieee80211_sub_if_data *sdata;
	188
be8755e1 MW	189	/* don't do anything if we've been removed already */
	190	if (sta_info_hash_del(local, sta))
	191	return;
	192
f0706e82 JB	193	list_del(&sta->list);
	194	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	195	if (sta->flags & WLAN_STA_PS) {
	196	sta->flags &= ~WLAN_STA_PS;
	197	if (sdata->bss)
	198	atomic_dec(&sdata->bss->num_sta_ps);
	199	}
	200	local->num_sta--;
	201	sta_info_remove_aid_ptr(sta);
be8755e1	202
f0706e82 JB	203	}
f0706e82 JB	204
be8755e1	205	void sta_info_free(struct sta_info *sta)
f0706e82 JB	206	{
	207	struct sk_buff *skb;
	208	struct ieee80211_local *local = sta->local;
0795af57	209	DECLARE_MAC_BUF(mac);
f0706e82	210
be8755e1 MW	211	might_sleep();
	212
	213	write_lock_bh(&local->sta_lock);
	214	sta_info_remove(sta);
	215	write_unlock_bh(&local->sta_lock);
f0706e82 JB	216
	217	while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
	218	local->total_ps_buffered--;
be8755e1	219	dev_kfree_skb(skb);
f0706e82 JB	220	}
f0706e82 JB	221	while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
be8755e1	222	dev_kfree_skb(skb);
f0706e82 JB	223	}
f0706e82 JB	224
be8755e1	225	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0795af57	226	printk(KERN_DEBUG "%s: Removed STA %s\n",
dd1cd4c6	227	wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
be8755e1 MW	228	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
be8755e1 MW	229
11a843b7 JB	230	ieee80211_key_free(sta->key);
11a843b7 JB	231	sta->key = NULL;
be8755e1	232
478f8d2b TW	233	if (local->ops->sta_notify)
	234	local->ops->sta_notify(local_to_hw(local), sta->dev->ifindex,
	235	STA_NOTIFY_REMOVE, sta->addr);
	236
be8755e1 MW	237	rate_control_remove_sta_debugfs(sta);
	238	ieee80211_sta_debugfs_remove(sta);
	239
	240	sta_info_put(sta);
f0706e82 JB	241	}
	242
	243
	244	static inline int sta_info_buffer_expired(struct ieee80211_local *local,
	245	struct sta_info *sta,
	246	struct sk_buff *skb)
	247	{
	248	struct ieee80211_tx_packet_data *pkt_data;
	249	int timeout;
	250
	251	if (!skb)
	252	return 0;
	253
	254	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
	255
	256	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
	257	timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
	258	15625) * HZ;
	259	if (timeout < STA_TX_BUFFER_EXPIRE)
	260	timeout = STA_TX_BUFFER_EXPIRE;
	261	return time_after(jiffies, pkt_data->jiffies + timeout);
	262	}
	263
	264
	265	static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
	266	struct sta_info *sta)
	267	{
	268	unsigned long flags;
	269	struct sk_buff *skb;
0795af57	270	DECLARE_MAC_BUF(mac);
f0706e82 JB	271
	272	if (skb_queue_empty(&sta->ps_tx_buf))
	273	return;
	274
	275	for (;;) {
	276	spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
	277	skb = skb_peek(&sta->ps_tx_buf);
	278	if (sta_info_buffer_expired(local, sta, skb)) {
	279	skb = __skb_dequeue(&sta->ps_tx_buf);
	280	if (skb_queue_empty(&sta->ps_tx_buf))
	281	sta->flags &= ~WLAN_STA_TIM;
	282	} else
	283	skb = NULL;
	284	spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
	285
	286	if (skb) {
	287	local->total_ps_buffered--;
	288	printk(KERN_DEBUG "Buffered frame expired (STA "
0795af57	289	"%s)\n", print_mac(mac, sta->addr));
f0706e82 JB	290	dev_kfree_skb(skb);
	291	} else
	292	break;
	293	}
	294	}
	295
	296
	297	static void sta_info_cleanup(unsigned long data)
	298	{
	299	struct ieee80211_local local = (struct ieee80211_local ) data;
	300	struct sta_info *sta;
	301
be8755e1	302	read_lock_bh(&local->sta_lock);
f0706e82 JB	303	list_for_each_entry(sta, &local->sta_list, list) {
	304	__sta_info_get(sta);
	305	sta_info_cleanup_expire_buffered(local, sta);
	306	sta_info_put(sta);
	307	}
be8755e1	308	read_unlock_bh(&local->sta_lock);
f0706e82	309
0d174406 JB	310	local->sta_cleanup.expires =
0d174406 JB	311	round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
f0706e82 JB	312	add_timer(&local->sta_cleanup);
	313	}
	314
e9f207f0 JB	315	#ifdef CONFIG_MAC80211_DEBUGFS
	316	static void sta_info_debugfs_add_task(struct work_struct *work)
	317	{
	318	struct ieee80211_local *local =
	319	container_of(work, struct ieee80211_local, sta_debugfs_add);
	320	struct sta_info sta, tmp;
	321
e9f207f0 JB	322	while (1) {
e9f207f0 JB	323	sta = NULL;
be8755e1	324	read_lock_bh(&local->sta_lock);
e9f207f0	325	list_for_each_entry(tmp, &local->sta_list, list) {
be8755e1	326	if (!tmp->debugfs.dir) {
e9f207f0 JB	327	sta = tmp;
	328	__sta_info_get(sta);
	329	break;
	330	}
	331	}
be8755e1	332	read_unlock_bh(&local->sta_lock);
e9f207f0 JB	333
	334	if (!sta)
	335	break;
	336
e9f207f0 JB	337	ieee80211_sta_debugfs_add(sta);
	338	rate_control_add_sta_debugfs(sta);
	339	sta_info_put(sta);
	340	}
	341	}
	342	#endif
	343
f0706e82 JB	344	void sta_info_init(struct ieee80211_local *local)
f0706e82 JB	345	{
be8755e1	346	rwlock_init(&local->sta_lock);
f0706e82	347	INIT_LIST_HEAD(&local->sta_list);
f0706e82	348
b24b8a24 PE	349	setup_timer(&local->sta_cleanup, sta_info_cleanup,
b24b8a24 PE	350	(unsigned long)local);
0d174406 JB	351	local->sta_cleanup.expires =
0d174406 JB	352	round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
e9f207f0 JB	353
	354	#ifdef CONFIG_MAC80211_DEBUGFS
	355	INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
	356	#endif
f0706e82 JB	357	}
	358
	359	int sta_info_start(struct ieee80211_local *local)
	360	{
	361	add_timer(&local->sta_cleanup);
	362	return 0;
	363	}
	364
	365	void sta_info_stop(struct ieee80211_local *local)
	366	{
f0706e82	367	del_timer(&local->sta_cleanup);
be8755e1	368	sta_info_flush(local, NULL);
f0706e82 JB	369	}
	370
	371	void sta_info_remove_aid_ptr(struct sta_info *sta)
	372	{
	373	struct ieee80211_sub_if_data *sdata;
	374
	375	if (sta->aid <= 0)
	376	return;
	377
	378	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	379
	380	if (sdata->local->ops->set_tim)
	381	sdata->local->ops->set_tim(local_to_hw(sdata->local),
	382	sta->aid, 0);
	383	if (sdata->bss)
	384	__bss_tim_clear(sdata->bss, sta->aid);
	385	}
	386
	387
	388	/**
	389	* sta_info_flush - flush matching STA entries from the STA table
	390	* @local: local interface data
	391	* @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
	392	*/
	393	void sta_info_flush(struct ieee80211_local local, struct net_device dev)
	394	{
	395	struct sta_info sta, tmp;
be8755e1	396	LIST_HEAD(tmp_list);
f0706e82	397
be8755e1	398	write_lock_bh(&local->sta_lock);
f0706e82	399	list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
be8755e1 MW	400	if (!dev \|\| dev == sta->dev) {
	401	__sta_info_get(sta);
	402	sta_info_remove(sta);
	403	list_add_tail(&sta->list, &tmp_list);
	404	}
	405	write_unlock_bh(&local->sta_lock);
	406
	407	list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
	408	sta_info_free(sta);
	409	sta_info_put(sta);
	410	}
f0706e82	411	}