}
/*
- * Add channel(s) and event(s) to newly registered apps
- * from lttng global UST domain.
+ * Validate UST version compatibility.
*/
- update_ust_app(ust_cmd.sock);
+ ret = ust_app_validate_version(ust_cmd.sock);
+ if (ret >= 0) {
+ /*
+ * Add channel(s) and event(s) to newly registered apps
+ * from lttng global UST domain.
+ */
+ update_ust_app(ust_cmd.sock);
+ }
ret = ust_app_register_done(ust_cmd.sock);
if (ret < 0) {