diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2afb96b801cb..4e15a3a5ad29 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 1b166c7ea891..e2932ea429e2 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 9feeb3766d7d..cce4771281d9 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;