From 8c53e46314562fe814b0afef6cfcbd2f562b017c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 14 Oct 2009 09:16:42 -0700 Subject: workqueue: add 'flush_delayed_work()' to run and wait for delayed work It basically turns a delayed work into an immediate work, and then waits for it to finish, thus allowing you to force (and wait for) an immediate flush of a delayed work. We'll want to use this in the tty layer to clean up tty_flush_to_ldisc(). Acked-by: Oleg Nesterov [ Fixed to use 'del_timer_sync()' as noted by Oleg ] Signed-off-by: Linus Torvalds --- kernel/workqueue.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'kernel') diff --git a/kernel/workqueue.c b/kernel/workqueue.c index addfe2df93b1..47cdd7e76f2b 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -639,6 +639,24 @@ int schedule_delayed_work(struct delayed_work *dwork, } EXPORT_SYMBOL(schedule_delayed_work); +/** + * flush_delayed_work - block until a dwork_struct's callback has terminated + * @dwork: the delayed work which is to be flushed + * + * Any timeout is cancelled, and any pending work is run immediately. + */ +void flush_delayed_work(struct delayed_work *dwork) +{ + if (del_timer_sync(&dwork->timer)) { + struct cpu_workqueue_struct *cwq; + cwq = wq_per_cpu(keventd_wq, get_cpu()); + __queue_work(cwq, &dwork->work); + put_cpu(); + } + flush_work(&dwork->work); +} +EXPORT_SYMBOL(flush_delayed_work); + /** * schedule_delayed_work_on - queue work in global workqueue on CPU after delay * @cpu: cpu to use -- cgit v1.2.3-58-ga151