Add lockdep annotations to flush_work() and update the comment.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- 26-rc2/kernel/workqueue.c~FW_LOCKDEP	2008-06-29 19:36:27.000000000 +0400
+++ 26-rc2/kernel/workqueue.c	2008-07-06 20:15:16.000000000 +0400
@@ -403,6 +403,8 @@ EXPORT_SYMBOL_GPL(flush_workqueue);
  * flush_work - block until a work_struct's callback has terminated
  * @work: the work which is to be flushed
  *
+ * Returns false if @work has already terminated.
+ *
  * It is expected that, prior to calling flush_work(), the caller has
  * arranged for the work to not be requeued, otherwise it doesn't make
  * sense to use this function.
@@ -418,6 +420,9 @@ int flush_work(struct work_struct *work)
 	if (!cwq)
 		return 0;
 
+	lock_acquire(&cwq->wq->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
+	lock_release(&cwq->wq->lockdep_map, 1, _THIS_IP_);
+
 	prev = NULL;
 	spin_lock_irq(&cwq->lock);
 	if (!list_empty(&work->entry)) {

--
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