added a safeguard

framework/unit_registry.c

@@ -326,20 +326,26 @@ bool ureg_finalize_all_init(void)
     while (li != NULL) {
         Unit *const pUnit = &li->unit;
 
+        if (pUnit->status == E_SUCCESS) {
+            dbg("! Unit seems already loaded, skipping");
+        } else {
             pUnit->status = pUnit->driver->init(pUnit);
             if (pUnit->status != E_SUCCESS) {
-            dbg("!!! error initing unit %s: %s", pUnit->name, error_get_message(pUnit->status));
+                dbg("!!! error initing unit %s: %s", pUnit->name,
+                    error_get_message(pUnit->status));
             }
 
             // try to assign unique callsigns
             // FIXME this is wrong, sometimes leads to duplicate CS
             if (pUnit->callsign == 0) {
                 pUnit->callsign = callsign++;
-        } else {
+            }
+            else {
                 if (pUnit->callsign >= callsign) {
                     callsign = (uint8_t) (pUnit->callsign + 1);
                 }
             }
+        }
 
         suc &= (pUnit->status == E_SUCCESS);
         li = li->next;