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authorJohannes Berg <johannes@sipsolutions.net>2009-10-29 03:34:00 -0400
committerJohn W. Linville <linville@tuxdriver.com>2009-10-30 15:50:25 -0400
commit2171abc58644e09dbba546d91366b12743115396 (patch)
treeb4b75fad9bb425034f71cf995586dd4898c93c2f /net/mac80211
parente55ea2b152569f09ef6bb28d5a341a4e5a21f5ce (diff)
mac80211: fix addba timer
The addba timer function acquires the sta spinlock, but at the same time we try to del_timer_sync() it under the spinlock which can produce deadlocks. To fix this, always del_timer_sync() the timer in ieee80211_process_addba_resp() and add it again after checking the conditions, if necessary. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/agg-tx.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index bd765f30dba2..b09948ceec4a 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -666,26 +666,25 @@ void ieee80211_process_addba_resp(struct ieee80211_local *local,
666 666
667 state = &sta->ampdu_mlme.tid_state_tx[tid]; 667 state = &sta->ampdu_mlme.tid_state_tx[tid];
668 668
669 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
670
669 spin_lock_bh(&sta->lock); 671 spin_lock_bh(&sta->lock);
670 672
671 if (!(*state & HT_ADDBA_REQUESTED_MSK)) { 673 if (!(*state & HT_ADDBA_REQUESTED_MSK))
672 spin_unlock_bh(&sta->lock); 674 goto timer_still_needed;
673 return;
674 }
675 675
676 if (mgmt->u.action.u.addba_resp.dialog_token != 676 if (mgmt->u.action.u.addba_resp.dialog_token !=
677 sta->ampdu_mlme.tid_tx[tid]->dialog_token) { 677 sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
678 spin_unlock_bh(&sta->lock);
679#ifdef CONFIG_MAC80211_HT_DEBUG 678#ifdef CONFIG_MAC80211_HT_DEBUG
680 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); 679 printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
681#endif /* CONFIG_MAC80211_HT_DEBUG */ 680#endif /* CONFIG_MAC80211_HT_DEBUG */
682 return; 681 goto timer_still_needed;
683 } 682 }
684 683
685 del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
686#ifdef CONFIG_MAC80211_HT_DEBUG 684#ifdef CONFIG_MAC80211_HT_DEBUG
687 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); 685 printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
688#endif /* CONFIG_MAC80211_HT_DEBUG */ 686#endif /* CONFIG_MAC80211_HT_DEBUG */
687
689 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) 688 if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
690 == WLAN_STATUS_SUCCESS) { 689 == WLAN_STATUS_SUCCESS) {
691 u8 curstate = *state; 690 u8 curstate = *state;
@@ -699,5 +698,11 @@ void ieee80211_process_addba_resp(struct ieee80211_local *local,
699 } else { 698 } else {
700 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); 699 ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
701 } 700 }
701
702 goto out;
703
704 timer_still_needed:
705 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
706 out:
702 spin_unlock_bh(&sta->lock); 707 spin_unlock_bh(&sta->lock);
703} 708}