From 6e74057c4686dc12ea767b4bdc50a63876056e1c Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 15 Sep 2009 20:02:33 -0400
Subject: [PATCH] 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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