scsi: set sc_data_direction in common code

The data direction fiel in the SCSI command is derived only from the block
request structure.  Move setting it up into common code instead of
duplicating it in the ULDs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

3 files changed, 7 insertions, 11 deletions

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2afb96b..4e15a3a 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1068,13 +1068,6 @@ 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;
@@ -1203,6 +1196,13 @@ 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 1b166c7..e2932ea 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..cce47712 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;