greybus: interface: fix timesync registration sequencing

When enabling an interface, control device should be registered after
having successfully added the timesync. Similarly for the interface
disable path, control device should be removed first before removing
timesync.

Testing Done:
 - Enable and disable the interface
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Suggested-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: David Lin <dtwlin@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/interface.c

@@ -1152,17 +1152,17 @@ int gb_interface_enable(struct gb_interface *intf)
 	if (ret)
 		goto err_destroy_bundles;
 
-	/* Register the control device and any bundles */
-	ret = gb_control_add(intf->control);
-	if (ret)
-		goto err_destroy_bundles;
-
 	ret = gb_timesync_interface_add(intf);
 	if (ret) {
 		dev_err(&intf->dev, "failed to add to timesync: %d\n", ret);
-		goto err_del_control;
+		goto err_destroy_bundles;
 	}
 
+	/* Register the control device and any bundles */
+	ret = gb_control_add(intf->control);
+	if (ret)
+		goto err_remove_timesync;
+
 	pm_runtime_use_autosuspend(&intf->dev);
 	pm_runtime_get_noresume(&intf->dev);
 	pm_runtime_set_active(&intf->dev);
@@ -1186,8 +1186,8 @@ int gb_interface_enable(struct gb_interface *intf)
 
 	return 0;
 
-err_del_control:
-	gb_control_del(intf->control);
+err_remove_timesync:
+	gb_timesync_interface_remove(intf);
 err_destroy_bundles:
 	list_for_each_entry_safe(bundle, tmp, &intf->bundles, links)
 		gb_bundle_destroy(bundle);
@@ -1229,8 +1229,8 @@ void gb_interface_disable(struct gb_interface *intf)
 	if (!intf->mode_switch && !intf->disconnected)
 		gb_control_interface_deactivate_prepare(intf->control);
 
-	gb_timesync_interface_remove(intf);
 	gb_control_del(intf->control);
+	gb_timesync_interface_remove(intf);
 	gb_control_disable(intf->control);
 	gb_control_put(intf->control);
 	intf->control = NULL;