From b98c06b6debfe84c90200143bb1102f312f50a33 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Thu, 24 Dec 2009 15:26:09 -0500 Subject: mac80211: fix race with suspend and dynamic_ps_disable_work When mac80211 suspends it calls a driver's suspend callback as a last step and after that the driver assumes no calls will be made to it until we resume and its start callback is kicked. If such calls are made, however, suspend can end up throwing hardware in an unexpected state and making the device unusable upon resume. Fix this by preventing mac80211 to schedule dynamic_ps_disable_work by checking for when mac80211 starts to suspend and starts quiescing. Frames should be allowed to go through though as that is part of the quiescing steps and we do not flush the mac80211 workqueue since it was already done towards the beginning of suspend cycle. The other mac80211 issue will be hanled in the next patch. For further details see refer to the thread: http://marc.info/?t=126144866100001&r=1&w=2 Cc: stable@kernel.org Signed-off-by: Luis R. Rodriguez Signed-off-by: John W. Linville --- net/mac80211/tx.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/mac80211') diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 8834cc93c716..27ceaefd7bc8 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1419,6 +1419,10 @@ static bool need_dynamic_ps(struct ieee80211_local *local) if (!local->ps_sdata) return false; + /* No point if we're going to suspend */ + if (local->quiescing) + return false; + return true; } -- cgit v1.2.3