diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2012-05-07 15:57:36 (GMT) |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-05-16 16:46:04 (GMT) |
| commit | 9e73dee7d38e9fa00f6dd1492cfbbc5719378e4a (patch) | |
| tree | 1f2681c5a41e5bc732e9468fececac6806e7bfaf /net | |
| parent | a9d3c05cca51d80ef2b9eddabf794c9458e36c2c (diff) | |
| download | linux-9e73dee7d38e9fa00f6dd1492cfbbc5719378e4a.tar.xz | |
mac80211: fix TX aggregation session timer
In commit 12d3952fc4a1cd96234bc7023bf7eefeb0bb6355
("mac80211: optimize aggregation session timeout handling")
two bugs were introduced:
1) RCU usage was completely broken since no locks are held
2) the timer must not rearm when agg session is stopping
Reported-and-tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/agg-tx.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index 5b7053c..7cf0715 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -421,16 +421,22 @@ static void sta_tx_agg_session_timer_expired(unsigned long data) struct tid_ampdu_tx *tid_tx; unsigned long timeout; - tid_tx = rcu_dereference_protected_tid_tx(sta, *ptid); - if (!tid_tx) + rcu_read_lock(); + tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); + if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { + rcu_read_unlock(); return; + } timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); if (time_is_after_jiffies(timeout)) { mod_timer(&tid_tx->session_timer, timeout); + rcu_read_unlock(); return; } + rcu_read_unlock(); + #ifdef CONFIG_MAC80211_HT_DEBUG printk(KERN_DEBUG "tx session timer expired on tid %d\n", (u16)*ptid); #endif |