diff --git a/doc/scst_user_spec.txt b/doc/scst_user_spec.txt
index 6eae9432c..b7122bdd2 100644
--- a/doc/scst_user_spec.txt
+++ b/doc/scst_user_spec.txt
@@ -98,7 +98,8 @@ space device. It doesn't have any parameters.
 
 During execution of SCST_USER_UNREGISTER_DEVICE at least one another
 thread must process all coming subcommands, otherwise after timeout it
-will fail with EBUSY error.
+will fail with EBUSY error. The processing should stop on receiving
+ENODEV error.
 
 SCST_USER_UNREGISTER_DEVICE returns 0 on success or -1 in case of error,
 and errno is set appropriately.
diff --git a/scst/src/dev_handlers/scst_user.c b/scst/src/dev_handlers/scst_user.c
index bef27a3cf..4370d5133 100644
--- a/scst/src/dev_handlers/scst_user.c
+++ b/scst/src/dev_handlers/scst_user.c
@@ -284,7 +284,7 @@ static inline int calc_num_pg(unsigned long buf, int len)
 
 static void __dev_user_not_reg(void)
 {
-	PRINT_ERROR("%s", "Device not registered");
+	TRACE(TRACE_MGMT_MINOR, "%s", "Device not registered");
 	return;
 }
 
@@ -292,7 +292,7 @@ static inline int dev_user_check_reg(struct scst_user_dev *dev)
 {
 	if (dev == NULL) {
 		__dev_user_not_reg();
-		return -EINVAL;
+		return -ENODEV;
 	}
 	return 0;
 }