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From: Oleg Nesterov <oleg@tv-sign.ru>
To: Jarek Poplawski <jarkao2@o2.pl>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Howells <dhowells@redhat.com>,
	David Miller <davem@davemloft.net>, Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cancel_delayed_work: use del_timer() instead of del_timer_sync()
Date: Fri, 27 Apr 2007 11:23:49 +0400	[thread overview]
Message-ID: <20070427072349.GA106@tv-sign.ru> (raw)
In-Reply-To: <20070427061506.GC997@ff.dom.local>

On 04/27, Jarek Poplawski wrote:
>
> According to workqueue.h:
> > /*
> >  * Kill off a pending schedule_delayed_work().  Note that the work callback
> >  * function may still be running on return from cancel_delayed_work().  Run
> >  * flush_workqueue() or cancel_work_sync() to wait on it.
> >  */
> > static inline int cancel_delayed_work(struct delayed_work *work)
> 
> So, we can do something like this:
> 
> cancel_delayed_work(dwork);
> flush_workqueue(wq);
> kfree(some_obj_used_by_dwork_func);
> 
> And this is enough to work with not rearming work.
> 
> But no more after this patch...

Yes, you are right, and so this patch is wrong.

This is even documented in the changelog, with this change cancel_delayed_work()
may return while the queueing is in progress. However, in that case we can not
rely on flush_workqueue/cancel_work_sync.

Thanks a lot!

Oleg.


      reply	other threads:[~2007-04-27  7:23 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-24 21:50 Oleg Nesterov
2007-04-25 10:04 ` David Howells
2007-04-25 13:02 ` Jarek Poplawski
2007-04-25 12:52   ` Oleg Nesterov
2007-04-26 14:29     ` Jarek Poplawski
2007-04-26 15:29       ` Oleg Nesterov
2007-04-27  6:15         ` Jarek Poplawski
2007-04-27  7:23           ` Oleg Nesterov [this message]

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