Re: [PATCH 2/9] dm: Fix a race condition related to stopping and starting queues

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On Mon, Sep 26, 2016 at 11:26:50AM -0700, Bart Van Assche wrote:
> Ensure that all ongoing dm_mq_queue_rq() and dm_mq_requeue_request()
> calls have stopped before setting the "queue stopped" flag. This
> allows to remove the "queue stopped" test from dm_mq_queue_rq() and
> dm_mq_requeue_request(). This patch fixes a race condition because
> dm_mq_queue_rq() is called without holding the queue lock and hence
> BLK_MQ_S_STOPPED can be set at any time while dm_mq_queue_rq() is
> in progress.
> 
> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
> Cc: Mike Snitzer <snitzer@xxxxxxxxxx>
> ---

Looks good,
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>

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Johannes Thumshirn                                          Storage
jthumshirn@xxxxxxx                                +49 911 74053 689
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