forked from luck/tmp_suning_uos_patched
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 <oleg@redhat.com> [ Fixed to use 'del_timer_sync()' as noted by Oleg ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -207,6 +207,7 @@ extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
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extern void flush_workqueue(struct workqueue_struct *wq);
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extern void flush_scheduled_work(void);
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extern void flush_delayed_work(struct delayed_work *work);
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extern int schedule_work(struct work_struct *work);
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extern int schedule_work_on(int cpu, struct work_struct *work);
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@ -639,6 +639,24 @@ int schedule_delayed_work(struct delayed_work *dwork,
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}
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EXPORT_SYMBOL(schedule_delayed_work);
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/**
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* flush_delayed_work - block until a dwork_struct's callback has terminated
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* @dwork: the delayed work which is to be flushed
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*
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* Any timeout is cancelled, and any pending work is run immediately.
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*/
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void flush_delayed_work(struct delayed_work *dwork)
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{
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if (del_timer_sync(&dwork->timer)) {
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struct cpu_workqueue_struct *cwq;
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cwq = wq_per_cpu(keventd_wq, get_cpu());
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__queue_work(cwq, &dwork->work);
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put_cpu();
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}
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flush_work(&dwork->work);
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}
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EXPORT_SYMBOL(flush_delayed_work);
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/**
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* schedule_delayed_work_on - queue work in global workqueue on CPU after delay
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* @cpu: cpu to use
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