diff -rub a/block/scsi_ioctl.c b/block/scsi_ioctl.c
--- a/block/scsi_ioctl.c	2006-08-07 00:18:54.000000000 -0400
+++ b/block/scsi_ioctl.c	2006-08-29 15:18:59.000000000 -0400
@@ -246,10 +246,10 @@
 		switch (hdr->dxfer_direction) {
 		default:
 			return -EINVAL;
-		case SG_DXFER_TO_FROM_DEV:
 		case SG_DXFER_TO_DEV:
 			writing = 1;
 			break;
+		case SG_DXFER_TO_FROM_DEV:
 		case SG_DXFER_FROM_DEV:
 			break;
 		}