From: Christian Lamparter <chunkeey@googlemail.com>
Date: Sun, 22 Aug 2010 21:48:25 +0000 (+0200)
Subject: mac80211: cancel restart_work in ieee80211_unregister_hw
X-Git-Tag: v2.6.37-rc1~147^2~584^2^2~78
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=258086a48b766d12a500f98834654ffa927ca475;p=pandora-kernel.git

mac80211: cancel restart_work in ieee80211_unregister_hw

Unlike most other workqueue-tasks, the restart_work is
not scheduled onto mac80211's private per-interface
workqueue, but onto one of the system-wide workqueues.

Therefore the mac80211-stack has to cancel any pending
restarts, before destroying the shared device context
and handing back the memory. Otherwise - under very
unlucky circumstances - there could be a stale work-
item left, because some other kernel component might
have delayed the execution of ieee80211_restart_work
for too long.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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