Re: [PATCH] add unschedule_delayed_work to the workqueue API

[Andrew Morton]

James Bottomley <James.Bottomley@xxxxxxxxxxxx> wrote:
>
> On Mon, 2004-10-18 at 16:26, James Bottomley wrote:
> > On Mon, 2004-10-18 at 16:25, Andrew Morton wrote:
> > > The usual way of doing this is:
> > > 
> > > 	cancel_delayed_work(...);
> 
> OK, found it in the headers, sorry .. it's not synchronous, so it can't
> really be used in most of the cases where we use del_timer_sync().

cancel_delayed_work() will tell you whether it successfully cancelled the
timer.  If it didn't, you should run flush_workqueue() to wait on the final
handler.  The combination of the two is synchronous.

The missing link is cancellation of a delayed work which re-adds itself and
where the calling code has no way of telling the handler to not re-arm
itself.  There's a patch in -mm to add that function, but I don't like it.
That's cancel_rearming_delayed_work.patch.
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