ocfs2_dlm: Flush dlm workqueue before starting to migrate
This is to prevent the condition in which a previously queued up assert master asserts after we start the migration. Now migration ensures the workqueue is flushed before proceeding with migrating the lock to another node. This condition is typically encountered during parallel umounts. Signed-off-by: NKurt Hackel <kurt.hackel@oracle.com> Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com> Signed-off-by: NMark Fasheh <mark.fasheh@oracle.com>
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