From: SungEun Kim <cleaneye.kim@lge.com>
Date: Fri, 3 Jul 2015 06:57:20 +0000 (+0900)
Subject: PM / autosleep: Use workqueue for user space wakeup sources garbage collector
X-Git-Tag: omap-for-v4.3/fixes-rc1~121^2~1^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ce12a977b7e484540482febe47d1e65f7427abf;p=pandora-kernel.git

PM / autosleep: Use workqueue for user space wakeup sources garbage collector

The synchronous synchronize_rcu() in wakeup_source_remove() makes
user process which writes to /sys/kernel/wake_unlock blocked sometimes.

For example, when android eventhub tries to release a wakelock, this
blocking process can occur, and eventhub can't get input events
for a while.

Using a work item instead of direct function call at pm_wake_unlock()
can prevent this unnecessary delay from happening.

Signed-off-by: SungEun Kim <cleaneye.kim@lge.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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