linux-kernel - Re: [PATCH] floppy: convert to delayed work and single-thread wq

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Date:	Wed, 16 May 2012 12:53:32 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Stephen Hemminger <shemminger@...tta.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] floppy: convert to delayed work and single-thread wq

On Wed, May 16, 2012 at 12:47:27PM -0700, Linus Torvalds wrote:
> On Wed, May 16, 2012 at 12:37 PM, Jiri Kosina <jkosina@...e.cz> wrote:
> > +       cancel_delayed_work_sync(&fd_timeout);
> > +       cancel_delayed_work_sync(&fd_timer);
> > +       destroy_workqueue(system_nrt_wq);
> 
> Well, *that* doesn't look right.
> 
> I think just a "flush_workqueue()" is in order.

System wqs shouldn't be flushed (nothing guarantees that flush will
finish in fixed amount of time).  We probably should make that
explicit by whining when someone tries to flush one of the system wqs.
Here, the two cancel_delayed_work_sync() calls should be enough.

Thanks.

-- 
tejun
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