scsi_dh_rdac: always retry MODE SELECT on command lock violation

If MODE SELECT returns with sense '05/91/36' (command lock violation)
it should always be retried without counting the number of retries.
During an HBA upgrade or similar circumstances one might see a flood
of MODE SELECT command from various HBAs, which will easily trigger
the sense code and exceed the retry count.

Cc: <stable@vger.kernel.org>
Signed-off-by: Hannes Reinecke <hare@suse.de>
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_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 3613581..93880ed 100644 (file)
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -562,7 +562,7 @@ static int mode_select_handle_sense(struct scsi_device *sdev,
                        /*
                         * Command Lock contention
                         */
-                       err = SCSI_DH_RETRY;
+                       err = SCSI_DH_IMM_RETRY;
                break;
        default:
                break;
@@ -612,6 +612,8 @@ retry:
                err = mode_select_handle_sense(sdev, h->sense);
                if (err == SCSI_DH_RETRY && retry_cnt--)
                        goto retry;
+               if (err == SCSI_DH_IMM_RETRY)
+                       goto retry;
        }
        if (err == SCSI_DH_OK) {
                h->state = RDAC_STATE_ACTIVE;