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scsi-disk: fix the check of the DBD bit in the MODE SENSE command 

The DBD bit does not work as expected.

SCSI-Spec:
http://ldkelley.com/SCSI2/SCSI2/SCSI2-08.html#8.2.10
"A disable block descriptors (DBD) bit of zero indicates that the target
may return zero or more block descriptors in the returned MODE SENSE
data (see 8.3.3), at the target's discretion. A DBD bit of one
specifies that the target shall not return any block descriptors in the
returned MODE SENSE data."

Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Bernhard Kohl 2010-08-31 14:08:27 +02:00 committed by Kevin Wolf
parent a9c17b2bf3
commit 333d50fe3d
1 changed files with 1 additions and 1 deletions
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2
hw/scsi-disk.c
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@ -655,7 +655,7 @@ static int scsi_disk_emulate_mode_sense(SCSIRequest *req, uint8_t *outbuf)
}
bdrv_get_geometry(s->bs, &nb_sectors);
if ((~dbd) & nb_sectors) {
if (!dbd && nb_sectors) {
if (req->cmd.buf[0] == MODE_SENSE) {
outbuf[3] = 8; /* Block descriptor length */
} else { /* MODE_SENSE_10 */