1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 32979fee6186..73994e2ac2cb 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -565,7 +565,8 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
         /* 
          * If SCSI-2 or lower, store the LUN value in cmnd.
          */
-        if (cmd->device->scsi_level <= SCSI_2) {
+        if (cmd->device->scsi_level <= SCSI_2 &&
+            cmd->device->scsi_level != SCSI_UNKNOWN) {
                 cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
                                (cmd->device->lun << 5 & 0xe0);
         }