tree 1fde8df76b399c12827c2e2bd989e29e83d9994f
parent 83ebade34bc1a90d0c3f77b87b940f336d075fda
author Chris Mason <chris.mason@oracle.com> 1253059062 -0400
committer Chris Mason <chris.mason@oracle.com> 1253060416 -0400

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>