Commit 5078b2e3 authored May 13, 2009 by Luis R. Rodriguez Committed by John W. Linville May 20, 2009

cfg80211: fix race between core hint and driver's custom apply



Its possible for cfg80211 to have scheduled the work and for
the global workqueue to not have kicked in prior to a cfg80211
driver's regulatory hint or wiphy_apply_custom_regulatory().

Although this is very unlikely its possible and should fix
this race. When this race would happen you are expected to have
hit a null pointer dereference panic.

Cc: stable@kernel.org
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

parent 267d493b

net/wireless/reg.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -1551,6 +1551,13 @@ static int regulatory_hint_core(const char *alpha2)

		queue_regulatory_request(request);

		/*
		* This ensures last_request is populated once modules
		* come swinging in and calling regulatory hints and
		* wiphy_apply_custom_regulatory().
		*/
		flush_scheduled_work();

		return 0;
		}