linux-kernel - Re: [PATCH 4/9] firewire: don't use PREPARE_DELAYED

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Message-ID: <20140221015935.GF6897@htj.dyndns.org>
Date:	Thu, 20 Feb 2014 20:59:35 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	laijs@...fujitsu.com, linux-kernel@...r.kernel.org,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net,
	Chris Boot <bootc@...tc.net>, linux-scsi@...r.kernel.org,
	target-devel@...r.kernel.org
Subject: Re: [PATCH 4/9] firewire: don't use PREPARE_DELAYED_WORK

Hello,

On Thu, Feb 20, 2014 at 08:44:46PM -0500, Peter Hurley wrote:
> >+static void fw_device_workfn(struct work_struct *work)
> >+{
> >+	struct fw_device *device = container_of(to_delayed_work(work),
> >+						struct fw_device, work);
> 
> I think this needs an smp_rmb() here.

The patch is equivalent transformation and the whole thing is
guaranteed to have gone through pool->lock.  No explicit rmb
necessary.

> IOW, the beginning of the work function should act like a barrier in
> the same way that queue_work_on() (et. al.) already does.

workqueue already has enough barriers; otherwise, the whole kernel
would have crumbled long time ago.

Thanks.

-- 
tejun
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