tree e7c70b8e08ab9e5363be28bcbcc72348122ae6e4
parent 627e421a3f35ad6b52dc58982fb6f8a97c30dcd7
author Chris Mason <chris.mason@oracle.com> 1253059353 -0400
committer Chris Mason <chris.mason@oracle.com> 1253060417 -0400

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>