scsi-generic: correct 6-bytes commands transfer length (Laurent Vivier)

According to SCSI documentation, for 6 bytes commands (READ(6),
WRITE(6)), if transfer length is 0 it specifies 256 blocks.
Signed-off-by: NLaurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5292 c046a42c-6fe2-441c-8c8c-71466251a162

hw/scsi-generic.c

@@ -352,6 +352,9 @@ static int scsi_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len)
     case 0:
         *len = cmd[4];
         *cmdlen = 6;
+        /* length 0 means 256 blocks */
+        if (*len == 0)
+            *len = 256;
         break;
     case 1:
     case 2: