zfcp: Revert to original scanning behaviour

zfcp has its own mechanism for selective scanning, so revert to the
original scanning behaviour to not confuse users.

Fixes: 4e91e876e9b8b6eb4255aa0d690778a89d3f1d28
Suggested-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NHannes Reinecke <hare@suse.com>
Reviewed-by: NBenjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/s390/scsi/zfcp_unit.c

@@ -27,7 +27,7 @@ void zfcp_unit_scsi_scan(struct zfcp_unit *unit)
 
 	if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
 		scsi_scan_target(&rport->dev, 0, rport->scsi_target_id, lun,
-				 SCSI_SCAN_RESCAN);
+				 SCSI_SCAN_MANUAL);
 }
 
 static void zfcp_unit_scsi_scan_work(struct work_struct *work)