mac80211: fix deadlock with multiple interfaces
authorJohannes Berg <johannes.berg@intel.com>
Tue, 5 Oct 2010 08:41:47 +0000 (10:41 +0200)
committerJohn W. Linville <linville@tuxdriver.com>
Tue, 5 Oct 2010 17:37:51 +0000 (13:37 -0400)
commit025e6be220e448c02045e8499c7db8ce4bc8eea2
tree0b28807104e80926d33eec8634dd94c5561e64ab
parent6774889314ba507483e63c014fcb81adfc127202
mac80211: fix deadlock with multiple interfaces

The locking around ieee80211_recalc_smps is
buggy -- it cannot acquire another interface's
mutex while the iflist mutex is held because
another code path could be holding the iface
mutex and trying to acquire the iflist mutex.

But the locking is also unnecessary, we only
check "ifmgd->associated" as a bool, and don't
use the pointer (in check_mgd_smps).

Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
net/mac80211/cfg.c
net/mac80211/ieee80211_i.h
net/mac80211/main.c
net/mac80211/mlme.c
net/mac80211/util.c