Commit 50a9432d authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
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mac80211: fix powersaving clients races 



The code to handle powersaving stations has a race:
when the powersave flag is lifted from a station,
we could transmit a packet that is being processed
for TX at the same time right away, even if there
are other frames queued for it. This would cause
frame reordering. To fix this, lift the flag only
under the appropriate lock that blocks TX.

Additionally, the code to allow drivers to block a
station while frames for it are on the HW queue is
never re-enabled the station, so traffic would get
stuck indefinitely. Fix this by clearing the flag
for this appropriately.

Finally, as an optimisation, don't do anything if
the driver unblocks an already unblocked station.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 4bce22b9

net/mac80211/ieee80211_i.h

+3 −0
Original line number Diff line number Diff line
@@ -1278,6 +1278,9 @@ void ieee80211_add_pending_skb(struct ieee80211_local *local, 
			       struct sk_buff *skb);

int ieee80211_add_pending_skbs(struct ieee80211_local *local,

			       struct sk_buff_head *skbs);

int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,

				  struct sk_buff_head *skbs,

				  void (*fn)(void *data), void *data);



void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,

			 u16 transaction, u16 auth_alg,

net/mac80211/rx.c

+0 −2
Original line number Diff line number Diff line
@@ -1102,8 +1102,6 @@ static void ap_sta_ps_end(struct sta_info *sta) 


	atomic_dec(&sdata->bss->num_sta_ps);



	clear_sta_flags(sta, WLAN_STA_PS_STA);



#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG

	printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n",

	       sdata->name, sta->sta.addr, sta->sta.aid);

net/mac80211/sta_info.c

+14 −3
Original line number Diff line number Diff line
@@ -199,8 +199,11 @@ static void sta_unblock(struct work_struct *wk) 


	if (!test_sta_flags(sta, WLAN_STA_PS_STA))

		ieee80211_sta_ps_deliver_wakeup(sta);

	else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL))

	else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) {

		clear_sta_flags(sta, WLAN_STA_PS_DRIVER);

		ieee80211_sta_ps_deliver_poll_response(sta);

	} else

		clear_sta_flags(sta, WLAN_STA_PS_DRIVER);

}



static int sta_prepare_rate_control(struct ieee80211_local *local,
@@ -880,6 +883,13 @@ struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, 
}

EXPORT_SYMBOL(ieee80211_find_sta);



static void clear_sta_ps_flags(void *_sta)

{

	struct sta_info *sta = _sta;



	clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA);

}



/* powersave support code */

void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)

{
@@ -894,7 +904,8 @@ void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) 


	/* Send all buffered frames to the station */

	sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);

	buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);

	buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,

						 clear_sta_ps_flags, sta);

	sent += buffered;

	local->total_ps_buffered -= buffered;
@@ -973,7 +984,7 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw, 


	if (block)

		set_sta_flags(sta, WLAN_STA_PS_DRIVER);

	else

	else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))

		ieee80211_queue_work(hw, &sta->drv_unblock_wk);

}

EXPORT_SYMBOL(ieee80211_sta_block_awake);

net/mac80211/util.c

+12 −2
Original line number Diff line number Diff line
@@ -368,8 +368,9 @@ void ieee80211_add_pending_skb(struct ieee80211_local *local, 
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

}



int ieee80211_add_pending_skbs(struct ieee80211_local *local,

			       struct sk_buff_head *skbs)

int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,

				  struct sk_buff_head *skbs,

				  void (*fn)(void *data), void *data)

{

	struct ieee80211_hw *hw = &local->hw;

	struct sk_buff *skb;
@@ -394,6 +395,9 @@ int ieee80211_add_pending_skbs(struct ieee80211_local *local, 
		__skb_queue_tail(&local->pending[queue], skb);

	}



	if (fn)

		fn(data);



	for (i = 0; i < hw->queues; i++)

		__ieee80211_wake_queue(hw, i,

			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
@@ -402,6 +406,12 @@ int ieee80211_add_pending_skbs(struct ieee80211_local *local, 
	return ret;

}



int ieee80211_add_pending_skbs(struct ieee80211_local *local,

			       struct sk_buff_head *skbs)

{

	return ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);

}



void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,

				    enum queue_stop_reason reason)

{

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