xfs: lock the AIL before removing the buffer item
Regression introduced by commit 46f9d2eb ("xfs: aborted buf items can be in the AIL") which fails to lock the AIL before removing the item. Spinlock debugging throws a warning about this. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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