scsi: hpsa: use bus '3' for legacy HBA devices

Older controllers use SCSI target id '0' for the first internal disk. As
the controllers are now placed on the same bus as the internal disks
this leads to a clash with the SCSI target id of controller.  This patch
checks the SCSI revision, and moves older controller to bus '3' to be
compatible with older releases and avoid this problem.

[mkp: fixed uninitialized variable]

Fixes: 09371d623c ("hpsa: Change SAS transport devices to bus 0.")
Cc: <stable@vger.kernel.org> # v4.5+
Signed-off-by: Hannes Reinecke <hare@suse.com>
Acked-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hpsa.c

@@ -2009,7 +2009,7 @@ static struct hpsa_scsi_dev_t *lookup_hpsa_scsi_dev(struct ctlr_info *h,
 
 static int hpsa_slave_alloc(struct scsi_device *sdev)
 {
-	struct hpsa_scsi_dev_t *sd;
+	struct hpsa_scsi_dev_t *sd = NULL;
 	unsigned long flags;
 	struct ctlr_info *h;
 
@@ -2026,7 +2026,8 @@ static int hpsa_slave_alloc(struct scsi_device *sdev)
 			sd->target = sdev_id(sdev);
 			sd->lun = sdev->lun;
 		}
-	} else
+	}
+	if (!sd)
 		sd = lookup_hpsa_scsi_dev(h, sdev_channel(sdev),
 					sdev_id(sdev), sdev->lun);
 
@@ -3840,6 +3841,7 @@ static int hpsa_update_device_info(struct ctlr_info *h,
 		sizeof(this_device->vendor));
 	memcpy(this_device->model, &inq_buff[16],
 		sizeof(this_device->model));
+	this_device->rev = inq_buff[2];
 	memset(this_device->device_id, 0,
 		sizeof(this_device->device_id));
 	if (hpsa_get_device_id(h, scsi3addr, this_device->device_id, 8,
@@ -3929,10 +3931,14 @@ static void figure_bus_target_lun(struct ctlr_info *h,
 
 	if (!is_logical_dev_addr_mode(lunaddrbytes)) {
 		/* physical device, target and lun filled in later */
-		if (is_hba_lunid(lunaddrbytes))
+		if (is_hba_lunid(lunaddrbytes)) {
+			int bus = HPSA_HBA_BUS;
+
+			if (!device->rev)
+				bus = HPSA_LEGACY_HBA_BUS;
 			hpsa_set_bus_target_lun(device,
-					HPSA_HBA_BUS, 0, lunid & 0x3fff);
-		else
+					bus, 0, lunid & 0x3fff);
+		} else
 			/* defer target, lun assignment for physical devices */
 			hpsa_set_bus_target_lun(device,
 					HPSA_PHYSICAL_DEVICE_BUS, -1, -1);