From a67da70dc0955580665f5444f318b92e69a3c272 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Fri, 25 Jul 2008 01:47:52 -0700 Subject: workqueues: lockdep annotations for flush_work() Add lockdep annotations to flush_work() and update the comment. Signed-off-by: Oleg Nesterov Cc: Jarek Poplawski Acked-by: Johannes Berg Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/workqueue.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel') diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 828e58230cb..4fcb75b9844 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -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)) { -- cgit v1.2.3