Disable mediator inside of eventloop

celery/worker/mediator.py

@@ -39,9 +39,9 @@ class WorkerComponent(StartStopComponent):
         w.mediator = None
 
     def include_if(self, w):
-        return (not w.disable_rate_limits or
-                w.pool_cls.requires_mediator and
-                not w.use_eventloop)
+        return ((not w.disable_rate_limits or
+                w.pool_cls.requires_mediator) and
+                    not w.use_eventloop)
 
     def create(self, w):
         m = w.mediator = self.instantiate(w.mediator_cls, w.ready_queue,