Ember wants a ListTopController, not a TopController

app/assets/javascripts/discourse/controllers/list_top_controller.js

@@ -1,12 +1,12 @@
 /**
   Controller of the top page
 
-  @class TopController
+  @class ListTopController
   @extends Discourse.ObjectController
   @namespace Discourse
   @module Discourse
 **/
-Discourse.TopController = Discourse.ObjectController.extend({
+Discourse.ListTopController = Discourse.ObjectController.extend({
 
   redirectedToTopPageReason: function() {
     // no need for a reason if the default homepage is "top"

app/assets/javascripts/discourse/routes/list_top_route.js

@@ -1,5 +1,9 @@
 Discourse.ListTopRoute = Discourse.Route.extend({
 
+  model: function() {
+    return Discourse.TopList.find();
+  },
+
   activate: function() {
     this._super();
     // will mark the "top" navigation item as selected
@@ -9,13 +13,6 @@ Discourse.ListTopRoute = Discourse.Route.extend({
     });
   },
 
-  setupController: function() {
-    var topController = this.controllerFor("top");
-    Discourse.TopList.find().then(function (result) {
-      topController.set("model", result);
-    });
-  },
-
   renderTemplate: function() {
     this.render('top', { into: 'list', outlet: 'listView' });
   },