diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 0d8afffd1683..991c6554bef4 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1737,8 +1737,13 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
        Sg_scatter_hold *rsv_schp = &sfp->reserve;
        struct request_queue *q = sfp->parentdp->device->request_queue;
        struct rq_map_data *md, map_data;
-       int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? ITER_SOURCE : ITER_DEST;
        struct scsi_cmnd *scmd;
+       int rw;
+       if (hp->dxfer_direction == SG_DXFER_TO_DEV ||
+           hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
+               rw = ITER_SOURCE;
+       else
+               rw = ITER_DEST;