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| author | Johannes Berg <johannes.berg@intel.com> | 2015-11-24 15:29:53 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2015-12-04 14:43:32 +0100 |
| commit | 856142cdaa483099f50cac70a16898ead8e4094d (patch) | |
| tree | af50ae58dbdf72df0bac750ae1019784a942e8eb /net/mac80211 | |
| parent | 63b4d8b3736b83126ea531c536eff9f76e4cd739 (diff) | |
| download | linux-856142cdaa483099f50cac70a16898ead8e4094d.tar.bz2 | |
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>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/util.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 74058020b7d6..08af2b307945 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -288,10 +288,13 @@ static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue, if (!test_bit(reason, &local->queue_stop_reasons[queue])) return; - if (!refcounted) + if (!refcounted) { local->q_stop_reasons[queue][reason] = 0; - else + } else { 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) __clear_bit(reason, &local->queue_stop_reasons[queue]); |