diff --git a/scst/src/scst_copy_mgr.c b/scst/src/scst_copy_mgr.c
index f2b7eb476..62fdb781a 100644
--- a/scst/src/scst_copy_mgr.c
+++ b/scst/src/scst_copy_mgr.c
@@ -2535,9 +2535,13 @@ static int scst_cm_dev_register(struct scst_device *dev, uint64_t lun)
 
 		list_for_each_entry(tgt_dev, head, sess_tgt_dev_list_entry) {
 			if (tgt_dev->dev == dev) {
+				/*
+				 * It's OK, because the copy manager could
+				 * auto register some devices
+				 */
 				TRACE_DBG("Copy Manager already registered "
 					"device %s", dev->virt_name);
-				res = -EEXIST;
+				res = 0;
 				goto out;
 			}
 		}