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scsi: Revert "scsi: core: map PQ=1, PDT=other values to SCSI_SCAN_TARGET_PRESENT"

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[ Upstream commit 15600159bcc6abbeae6b33a849bef90dca28b78f ]

This reverts commit 948e922fc4.

Not all targets that return PQ=1 and PDT=0 should be ignored. While
the SCSI spec is vague in this department, there appears to be a
critical mass of devices which rely on devices being accessible with
this combination of reported values.

Fixes: 948e922fc4 ("scsi: core: map PQ=1, PDT=other values to SCSI_SCAN_TARGET_PRESENT")
Link: https://lore.kernel.org/r/yq1lelrleqr.fsf@ca-mkp.ca.oracle.com
Acked-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Martin Wilck <mwilck@suse.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Martin K. Petersen 2023-01-26 22:06:08 -05:00 committed by Greg Kroah-Hartman
parent 14be8b0c4e
commit 21081886de
1 changed files with 3 additions and 4 deletions
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7
drivers/scsi/scsi_scan.c
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@ -1130,8 +1130,7 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
* that no LUN is present, so don't add sdev in these cases.
* Two specific examples are:
* 1) NetApp targets: return PQ=1, PDT=0x1f
* 2) IBM/2145 targets: return PQ=1, PDT=0
* 3) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
* 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
* in the UFI 1.0 spec (we cannot rely on reserved bits).
*
* References:
@ -1145,8 +1144,8 @@ static int scsi_probe_and_add_lun(struct scsi_target *starget,
* PDT=00h Direct-access device (floppy)
* PDT=1Fh none (no FDD connected to the requested logical unit)
*/
if (((result[0] >> 5) == 1 ||
(starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f)) &&
if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
(result[0] & 0x1f) == 0x1f &&
!scsi_is_wlun(lun)) {
SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
"scsi scan: peripheral device type"