From: Alan Stern <stern@rowland.harvard.edu>
Date: Mon, 26 Mar 2012 20:46:52 +0000 (+0200)
Subject: PM / Runtime: don't forget to wake up waitqueue on failure
X-Git-Tag: v3.4-rc2~19^2~9^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2791d733a2f06997b573d1a3cfde21e6f529826;p=pandora-kernel.git

PM / Runtime: don't forget to wake up waitqueue on failure

This patch (as1535) fixes a bug in the runtime PM core.  When a
runtime suspend attempt completes, whether successfully or not, the
device's power.wait_queue is supposed to be signalled.  But this
doesn't happen in the failure pathway of rpm_suspend() when another
autosuspend attempt is rescheduled.  As a result, a task can get stuck
indefinitely on the wait queue (I have seen this happen in testing).

The patch fixes the problem by moving the wake_up_all() call up near
the start of the failure code.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---

Reading git-diff-tree failed