From: Chris Mason <chris.mason@oracle.com>
Date: Wed, 16 Sep 2009 00:02:33 +0000 (-0400)
Subject: Btrfs: Fix async thread shutdown race
X-Git-Tag: v2.6.32-rc1~57^2^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e74057c4686dc12ea767b4bdc50a63876056e1c;p=pandora-kernel.git

Btrfs: Fix async thread shutdown race

It was possible for an async worker thread to be selected to
receive a new work item, but exit before the work item was
actually placed into that thread's work list.

This commit fixes the race by incrementing the num_pending
counter earlier, and making sure to check the number of pending
work items before a thread exits.

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