[Qemu-devel] [RFC PATCH 1/6] scsi: ignore LUN field in the CDB

[Paolo Bonzini]

The LUN field in the CDB is a historical relic.  Ignore it as reserved,
which is what modern SCSI specifications actually say.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 hw/scsi-disk.c    |    6 +++---
 hw/scsi-generic.c |    5 ++---
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 4c7a53e..b14c32f 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -516,7 +516,7 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, 
uint8_t *outbuf)
 
     memset(outbuf, 0, buflen);
 
-    if (req->lun || req->cmd.buf[1] >> 5) {
+    if (req->lun) {
         outbuf[0] = 0x7f;      /* LUN not supported */
         return buflen;
     }
@@ -1022,9 +1022,9 @@ static int32_t scsi_send_command(SCSIRequest *req, 
uint8_t *buf)
     }
 #endif
 
-    if (req->lun || buf[1] >> 5) {
+    if (req->lun) {
         /* Only LUN 0 supported.  */
-        DPRINTF("Unimplemented LUN %d\n", req->lun ? req->lun : buf[1] >> 5);
+        DPRINTF("Unimplemented LUN %d\n", req->lun);
         if (command != REQUEST_SENSE && command != INQUIRY) {
             scsi_command_complete(r, CHECK_CONDITION,
                                   SENSE_CODE(LUN_NOT_SUPPORTED));
diff --git a/hw/scsi-generic.c b/hw/scsi-generic.c
index 0c04606..e6f0efd 100644
--- a/hw/scsi-generic.c
+++ b/hw/scsi-generic.c
@@ -335,9 +335,8 @@ static int32_t scsi_send_command(SCSIRequest *req, uint8_t 
*cmd)
     SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
     int ret;
 
-    if (cmd[0] != REQUEST_SENSE &&
-        (req->lun != s->lun || (cmd[1] >> 5) != s->lun)) {
-        DPRINTF("Unimplemented LUN %d\n", req->lun ? req->lun : cmd[1] >> 5);
+    if (cmd[0] != REQUEST_SENSE && req->lun != s->lun) {
+        DPRINTF("Unimplemented LUN %d\n", req->lun);
         scsi_set_sense(s, SENSE_CODE(LUN_NOT_SUPPORTED));
         r->req.status = CHECK_CONDITION;
         scsi_req_complete(&r->req);
-- 
1.7.4.4