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mac80211: catch queue stop underflow 

If some code stops the queues more times than having started
(for when refcounting is used), warn on and reset the counter
to 0 to avoid blocking forever.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2015-11-24 15:29:53 +01:00
parent 63b4d8b373
commit 856142cdaa
1 changed files with 5 additions and 2 deletions
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7
net/mac80211/util.c
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@ -288,10 +288,13 @@ static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
if (!test_bit(reason, &local->queue_stop_reasons[queue])) if (!test_bit(reason, &local->queue_stop_reasons[queue]))
return; return;
if (!refcounted) if (!refcounted) {
local->q_stop_reasons[queue][reason] = 0; local->q_stop_reasons[queue][reason] = 0;
else } else {
local->q_stop_reasons[queue][reason]--; local->q_stop_reasons[queue][reason]--;
if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
local->q_stop_reasons[queue][reason] = 0;
}
if (local->q_stop_reasons[queue][reason] == 0) if (local->q_stop_reasons[queue][reason] == 0)
__clear_bit(reason, &local->queue_stop_reasons[queue]); __clear_bit(reason, &local->queue_stop_reasons[queue]);