Re: [PATCH 03/10] scsi: set sc_data_direction in common code

[Hannes Reinecke <hare@suse.de>]

On 06/29/2014 03:34 PM, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   drivers/scsi/scsi_lib.c |   14 +++++++-------
>   drivers/scsi/sd.c       |    2 --
>   drivers/scsi/sr.c       |    2 --
>   3 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index bc84811..ea23860 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1101,13 +1101,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
>   	}
>
>   	cmd->cmd_len = req->cmd_len;
> -	if (!blk_rq_bytes(req))
> -		cmd->sc_data_direction = DMA_NONE;
> -	else if (rq_data_dir(req) == WRITE)
> -		cmd->sc_data_direction = DMA_TO_DEVICE;
> -	else
> -		cmd->sc_data_direction = DMA_FROM_DEVICE;
> -	
>   	cmd->transfersize = blk_rq_bytes(req);
>   	cmd->allowed = req->retries;
>   	return BLKPREP_OK;
> @@ -1236,6 +1229,13 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
>   		goto out;
>   	}
>
> +	if (!blk_rq_bytes(req))
> +		cmd->sc_data_direction = DMA_NONE;
> +	else if (rq_data_dir(req) == WRITE)
> +		cmd->sc_data_direction = DMA_TO_DEVICE;
> +	else
> +		cmd->sc_data_direction = DMA_FROM_DEVICE;
> +
>   	switch (req->cmd_type) {
>   	case REQ_TYPE_FS:
>   		ret = scsi_setup_fs_cmnd(sdev, req);
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 001b3e8..d88bdc8 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -994,14 +994,12 @@ static int sd_init_command(struct scsi_cmnd *SCpnt)
>   			goto out;
>   		}
>   		SCpnt->cmnd[0] = WRITE_6;
> -		SCpnt->sc_data_direction = DMA_TO_DEVICE;
>
>   		if (blk_integrity_rq(rq))
>   			sd_dif_prepare(rq, block, sdp->sector_size);
>
>   	} else if (rq_data_dir(rq) == READ) {
>   		SCpnt->cmnd[0] = READ_6;
> -		SCpnt->sc_data_direction = DMA_FROM_DEVICE;
>   	} else {
>   		scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
>   		goto out;
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index 9feeb37..cce4771 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -438,11 +438,9 @@ static int sr_init_command(struct scsi_cmnd *SCpnt)
>   		if (!cd->device->writeable)
>   			goto out;
>   		SCpnt->cmnd[0] = WRITE_10;
> -		SCpnt->sc_data_direction = DMA_TO_DEVICE;
>   		cd->cdi.media_written = 1;
>   	} else if (rq_data_dir(rq) == READ) {
>   		SCpnt->cmnd[0] = READ_10;
> -		SCpnt->sc_data_direction = DMA_FROM_DEVICE;
>   	} else {
>   		blk_dump_rq_flags(rq, "Unknown sr command");
>   		goto out;
>
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.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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