From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Fri, 30 Aug 2013 12:19:46 +0000 (+0200)
Subject: PM / hibernate / memory hotplug: Rework mutual exclusion
X-Git-Tag: v3.12-rc1~35^2~7^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=942f40155a743f4204308d62405dacaa4bfadb11;p=pandora-kernel.git

PM / hibernate / memory hotplug: Rework mutual exclusion

Since all of the memory hotplug operations have to be carried out
under device_hotplug_lock, they won't need to acquire pm_mutex if
device_hotplug_lock is held around hibernation.

For this reason, make the hibernation code acquire
device_hotplug_lock after freezing user space processes and
release it before thawing them.  At the same tim drop the
lock_system_sleep() and unlock_system_sleep() calls from
lock_memory_hotplug() and unlock_memory_hotplug(), respectively.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
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