scsi_dh_alua: Disable ALUA handling for non-disk devices
Non-disk devices might support ALUA, but the firmware
implementation is untested and frequently broken.
As we're don't actually need it disable ALUA support
for non-disk device for now.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index cc2773b..7d01ef0 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -320,6 +320,18 @@
{
int err = SCSI_DH_OK;
+ /*
+ * ALUA support for non-disk devices is fraught with
+ * difficulties, so disable it for now.
+ */
+ if (sdev->type != TYPE_DISK) {
+ h->tpgs = TPGS_MODE_NONE;
+ sdev_printk(KERN_INFO, sdev,
+ "%s: disable for non-disk devices\n",
+ ALUA_DH_NAME);
+ return SCSI_DH_DEV_UNSUPP;
+ }
+
h->tpgs = scsi_device_tpgs(sdev);
switch (h->tpgs) {
case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT: