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workqueues: lockdep annotations for flush_work()

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

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Jarek Poplawski <jarkao2@o2.pl>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:52 -07:00 committed by Linus Torvalds
parent 69b895fd13
commit a67da70dc0
1 changed files with 5 additions and 0 deletions
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5
kernel/workqueue.c
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@ -427,6 +427,8 @@ 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.
@ -442,6 +444,9 @@ 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)) {