linux-kernel - Re: [PATCH V2] scsi: core: use blk_mq_requeue_request in __scsi_queue

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Date:   Thu, 01 Mar 2018 20:44:10 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        Bart.VanAssche@....com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH V2] scsi: core: use blk_mq_requeue_request in __scsi_queue_insert


Jianchao,

> In scsi core, __scsi_queue_insert should just put request back on the
> queue and retry using the same command as before. However, for blk-mq,
> scsi_mq_requeue_cmd is employed here which will unprepare the
> request. To align with the semantics of __scsi_queue_insert, use
> blk_mq_requeue_request with kick_requeue_list == true and put the
> reference of scsi_device.
>
> V1 -> V2:
>  - add put_device on scsi_device->sdev_gendev

Also, please put changelog after the --- delimiter.

> Cc: Christoph Hellwig <hch@....de>
> Signed-off-by: Jianchao Wang <jianchao.w.wang@...cle.com>
> ---
>  drivers/scsi/scsi_lib.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index a86df9c..6fa7b0c 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -191,7 +191,8 @@ static void __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, bool unbusy)
>  	 */
>  	cmd->result = 0;
>  	if (q->mq_ops) {
> -		scsi_mq_requeue_cmd(cmd);
> +		blk_mq_requeue_request(cmd->request, true);
> +		put_device(&device->sdev_gendev);
>  		return;
>  	}
>  	spin_lock_irqsave(q->queue_lock, flags);

-- 
Martin K. Petersen	Oracle Linux Engineering