cfg80211: fix race on init and driver registration
authorLuis R. Rodriguez <mcgrof@qca.qualcomm.com>
Mon, 28 Nov 2011 21:47:15 +0000 (16:47 -0500)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 9 Dec 2011 16:55:46 +0000 (08:55 -0800)
commit5b157407b89257481a639b869f0f42532fceafaa
tree40cb282eafbc0af631aea00b269a21f3dfe5722e
parent22e244d6a7b8bedfd87cba78d339b2baee00609c
cfg80211: fix race on init and driver registration

commit a042994dd377d86bff9446ee76151ceb6267c9ba upstream.

There is a theoretical race that if hit will trigger
a crash. The race is between when we issue the first
regulatory hint, regulatory_hint_core(), gets processed
by the workqueue and between when the first device
gets registered to the wireless core. This is not easy
to reproduce but it was easy to do so through the
regulatory simulator I have been working on. This
is a port of the fix I implemented there [1].

[1] https://github.com/mcgrof/regsim/commit/a246ccf81f059cb662eee288aa13100f631e4cc8

Cc: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
net/wireless/reg.c