From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 15 Sep 2009 23:57:42 +0000 (-0400)
Subject: Btrfs: fix async worker startup race
X-Git-Tag: v2.6.32-rc1~57^2^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e99d8eb347c93a5d38081380b8c9e69b203212e;p=pandora-kernel.git

Btrfs: fix async worker startup race

After a new worker thread starts, it is placed into the
list of idle threads.  But, this may race with a
check for idle done by the worker thread itself, resulting
in a double list_add operation.

This fix adds a check to make sure the idle thread addition
is done properly.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
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