From: Martin Peres <martin.peres@labri.fr>
Date: Thu, 13 Mar 2014 23:26:52 +0000 (+0100)
Subject: drm/nouveau/pm/fan: drop the fan lock in fan_update() before rescheduling
X-Git-Tag: v3.15-rc1~51^2~39^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61679fe153b2b9ea5b5e2ab93305419e85e99a9d;p=pandora-kernel.git

drm/nouveau/pm/fan: drop the fan lock in fan_update() before rescheduling

This should fix a deadlock that has been reported to us where fan_update()
would hold the fan lock and try to grab the alarm_program_lock to reschedule
an update. On an other CPU, the alarm_program_lock would have been taken
before calling fan_update(), leading to a deadlock.

We should Cc: <stable@vger.kernel.org> # 3.9+

Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Tested-by: Timothée Ravier <tim@siosm.fr>
Tested-by: Boris Fersing (IRC nick fersingb, no public email address)
Signed-off-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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