Re: workqueue and pending

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

>  static inline int cancel_delayed_work(struct work_struct *work)
>  {
> -	return del_timer_sync(&work->timer);
> +	int ret;
> +
> +	ret = del_timer_sync(&work->timer);
> +	if (ret)
> +		clear_bit(0, &work->pending);
> +	return ret;
>  }

Heh, I was trying to figure out a simple way to do that and just
didn't figure out del_timer_sync() would actually have a useful
return value :)

It's probably still good to precise explicitely in the comments
that upon return of cancel_delayed_work(), the work queue might
still be pending and that a flush and whoever called this may
still need a flush_scheduled_work() or flush_workqueue() (provided
it's running in a context where that can sleep)

Ben.