linux-kernel - Re: [PATCH 01/14] sd: don't use rq->cmd

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Date:	Wed, 09 Jul 2014 13:12:34 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Christoph Hellwig <hch@....de>,
	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Jens Axboe <axboe@...nel.dk>,
	Bart Van Assche <bvanassche@...ionio.com>,
	Robert Elliott <Elliott@...com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] sd: don't use rq->cmd_len before setting it up

On 06/25/2014 06:51 PM, Christoph Hellwig wrote:
> Unlike the old request code blk-mq doesn't initialize cmd_len with a
> default value, so don't rely on it being set in sd_setup_write_same_cmnd.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>   drivers/scsi/sd.c |    3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 9c86e3d..6ec4ffe 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -824,15 +824,16 @@ static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
>
>   	rq->__data_len = sdp->sector_size;
>   	rq->timeout = SD_WRITE_SAME_TIMEOUT;
> -	memset(rq->cmd, 0, rq->cmd_len);
>
>   	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
>   		rq->cmd_len = 16;
> +		memset(rq->cmd, 0, rq->cmd_len);
>   		rq->cmd[0] = WRITE_SAME_16;
>   		put_unaligned_be64(sector, &rq->cmd[2]);
>   		put_unaligned_be32(nr_sectors, &rq->cmd[10]);
>   	} else {
>   		rq->cmd_len = 10;
> +		memset(rq->cmd, 0, rq->cmd_len);
>   		rq->cmd[0] = WRITE_SAME;
>   		put_unaligned_be32(sector, &rq->cmd[2]);
>   		put_unaligned_be16(nr_sectors, &rq->cmd[7]);
>
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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