linux-kernel - Re: [PATCH] nbd: Add locking for tasks

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Message-ID: <5616D065.6070708@kernel.dk>
Date:	Thu, 8 Oct 2015 14:21:57 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Ben Hutchings <ben@...adent.org.uk>,
	Markus Pargmann <mpa@...gutronix.de>
Cc:	nbd-general@...ts.sourceforge.net,
	Michal Belczyk <belczyk@....krakow.pl>,
	Hermann Lauer <Hermann.Lauer@....uni-heidelberg.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nbd: Add locking for tasks

On 10/08/2015 02:14 PM, Ben Hutchings wrote:
> On Tue, 2015-10-06 at 20:03 +0200, Markus Pargmann wrote:
>> The timeout handling introduced in
>> 	> 7e2893a16d3e (nbd: Fix timeout detection)
>> introduces a race condition which may lead to killing of tasks that are
>> not in nbd context anymore. This was not observed or reproducable yet.
>>
>> This patch adds locking to critical use of task_recv and task_send to
>> avoid killing tasks that already left the NBD thread functions. This
>> lock is only acquired if a timeout occures or the nbd device
>> starts/stops.
>>
>> Reported-by: Ben Hutchings <ben@...adent.org.uk>
>> Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
>
> Reviewed-by: Ben Hutchings <ben@...adent.org.uk>
>
> You could add 'Fixes: 7e2893a16d3e ("nbd: Fix timeout detection")' to
> the commit message as well.

I've added your review and the Fixes and added it for this series. 
Thanks guys.

-- 
Jens Axboe

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