From: Liu ShuoX <shuox.liu@intel.com>
Date: Thu, 11 Jul 2013 08:03:45 +0000 (+0800)
Subject: PM / Sleep: avoid 'autosleep' in shutdown progress
X-Git-Tag: v3.11-rc2~13^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e5248a111bf4048a9f3fab1a9c94c4630a10592a;p=pandora-kernel.git

PM / Sleep: avoid 'autosleep' in shutdown progress

Prevent automatic system suspend from happening during system
shutdown by making try_to_suspend() check system_state and return
immediately if it is not SYSTEM_RUNNING.

This prevents the following breakage from happening (scenario from
Zhang Yanmin):

 Kernel starts shutdown and calls all device driver's shutdown
 callback.  When a driver's shutdown is called, the last wakelock is
 released and suspend-to-ram starts.  However, as some driver's shut
 down callbacks already shut down devices and disabled runtime pm,
 the suspend-to-ram calls driver's suspend callback without noticing
 that device is already off and causes crash.

[rjw: Changelog]
Signed-off-by: Liu ShuoX <shuox.liu@intel.com>
Cc: 3.5+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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