ofono: take D-Bus proxy for ConnectionManager asynchronously

Also,

  - disconnect signals from connman_proxy in dispose()

  - don't take reference to self for GetProperties call

src/devices/wwan/nm-modem-ofono.c

@@ -46,6 +46,7 @@ typedef struct {
 	GDBusProxy *context_proxy;
 	GDBusProxy *sim_proxy;
 
+	GCancellable *connman_proxy_cancellable;
 	GCancellable *sim_proxy_cancellable;
 
 	GError *property_error;
@@ -552,22 +553,35 @@ connman_property_changed (GDBusProxy *proxy,
 }
 
 static void
-connman_get_properties_done (GDBusProxy *proxy, GAsyncResult *result, gpointer user_data)
+connman_get_properties_done (GObject *source,
+                             GAsyncResult *result,
+                             gpointer user_data)
 {
-	gs_unref_object NMModemOfono *self = NM_MODEM_OFONO (user_data);
+	NMModemOfono *self;
-	GError *error = NULL;
+	NMModemOfonoPrivate *priv;
-	GVariant *v_properties, *v_dict, *v;
+	gs_free_error GError *error = NULL;
+	gs_unref_variant GVariant *v_properties = NULL;
+	gs_unref_variant GVariant *v_dict = NULL;
+	GVariant *v;
 	GVariantIter i;
 	const char *property;
 
-	v_properties = _nm_dbus_proxy_call_finish (proxy,
+	v_properties = _nm_dbus_proxy_call_finish (G_DBUS_PROXY (source),
-		                                       result,
+	                                           result,
-		                                       G_VARIANT_TYPE ("(a{sv})"),
+	                                           G_VARIANT_TYPE ("(a{sv})"),
-		                                       &error);
+	                                           &error);
+	if (   !v_properties
+	    && g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+		return;
+
+	self = NM_MODEM_OFONO (user_data);
+	priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	g_clear_object (&priv->connman_proxy_cancellable);
+
 	if (!v_properties) {
 		g_dbus_error_strip_remote_error (error);
 		_LOGW ("error getting connman properties: %s", error->message);
-		g_error_free (error);
 		return;
 	}
 
@@ -587,9 +601,48 @@ connman_get_properties_done (GDBusProxy *proxy, GAsyncResult *result, gpointer u
 		handle_connman_property (NULL, property, v, self);
 		g_variant_unref (v);
 	}
+}
 
-	g_variant_unref (v_dict);
+static void
-	g_variant_unref (v_properties);
+_connman_proxy_new_cb (GObject *source,
+                       GAsyncResult *result,
+                       gpointer user_data)
+{
+	NMModemOfono *self;
+	NMModemOfonoPrivate *priv;
+	gs_free_error GError *error = NULL;
+	GDBusProxy *proxy;
+
+	proxy = g_dbus_proxy_new_for_bus_finish (result, &error);
+	if (   !proxy
+	    && g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
+		return;
+
+	self = user_data;
+	priv = NM_MODEM_OFONO_GET_PRIVATE (self);
+
+	if (!proxy) {
+		_LOGW ("failed to create ConnectionManager proxy: %s", error->message);
+		g_clear_object (&priv->connman_proxy_cancellable);
+		return;
+	}
+
+	priv->connman_proxy = proxy;
+
+	_nm_dbus_signal_connect (priv->connman_proxy,
+	                         "PropertyChanged",
+	                         G_VARIANT_TYPE ("(sv)"),
+	                         G_CALLBACK (connman_property_changed),
+	                         self);
+
+	g_dbus_proxy_call (priv->connman_proxy,
+	                   "GetProperties",
+	                   NULL,
+	                   G_DBUS_CALL_FLAGS_NONE,
+	                   20000,
+	                   priv->connman_proxy_cancellable,
+	                   connman_get_properties_done,
+	                   self);
 }
 
 static void
@@ -599,11 +652,13 @@ handle_connman_iface (NMModemOfono *self, gboolean found)
 
 	_LOGD ("ConnectionManager interface %sfound", found ? "" : "not ");
 
-	if (!found && priv->connman_proxy) {
+	if (!found && (priv->connman_proxy || priv->connman_proxy_cancellable)) {
 		_LOGI ("ConnectionManager interface disappeared");
-
+		nm_clear_g_cancellable (&priv->connman_proxy_cancellable);
-		g_signal_handlers_disconnect_by_data (priv->connman_proxy, NM_MODEM_OFONO (self));
+		if (priv->connman_proxy) {
-		g_clear_object (&priv->connman_proxy);
+			g_signal_handlers_disconnect_by_data (priv->connman_proxy, self);
+			g_clear_object (&priv->connman_proxy);
+		}
 
 		/* The connection manager proxy disappeared, we should
 		 * consider the modem disabled.
@@ -611,41 +666,21 @@ handle_connman_iface (NMModemOfono *self, gboolean found)
 		priv->gprs_attached = FALSE;
 
 		update_modem_state (self);
-	} else if (found && !priv->connman_proxy) {
+	} else if (found && (!priv->connman_proxy && !priv->connman_proxy_cancellable)) {
-		GError *error = NULL;
-
 		_LOGI ("found new ConnectionManager interface");
 
-		priv->connman_proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
+		priv->connman_proxy_cancellable = g_cancellable_new ();
-		                                                     G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES
-		                                                     | G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
-		                                                     NULL, /* GDBusInterfaceInfo */
-		                                                     OFONO_DBUS_SERVICE,
-		                                                     nm_modem_get_path (NM_MODEM (self)),
-		                                                     OFONO_DBUS_INTERFACE_CONNECTION_MANAGER,
-		                                                     NULL, /* GCancellable */
-		                                                     &error);
-		if (priv->connman_proxy == NULL) {
-			_LOGW ("failed to create ConnectionManager proxy: %s", error->message);
-			g_error_free (error);
-			return;
-		}
 
-		/* Watch for custom ofono PropertyChanged signals */
+		g_dbus_proxy_new_for_bus (G_BUS_TYPE_SYSTEM,
-		_nm_dbus_signal_connect (priv->connman_proxy,
+		                            G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES
-		                         "PropertyChanged",
+		                          | G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
-		                         G_VARIANT_TYPE ("(sv)"),
+		                          NULL, /* GDBusInterfaceInfo */
-		                         G_CALLBACK (connman_property_changed),
+		                          OFONO_DBUS_SERVICE,
-		                         self);
+		                          nm_modem_get_path (NM_MODEM (self)),
-
+		                          OFONO_DBUS_INTERFACE_CONNECTION_MANAGER,
-		g_dbus_proxy_call (priv->connman_proxy,
+		                          priv->connman_proxy_cancellable,
-		                   "GetProperties",
+		                          _connman_proxy_new_cb,
-		                   NULL,
+		                          NULL);
-		                   G_DBUS_CALL_FLAGS_NONE,
-		                   20000,
-		                   NULL,
-		                   (GAsyncReadyCallback) connman_get_properties_done,
-		                   g_object_ref (self));
 	}
 }
 
@@ -1201,6 +1236,7 @@ dispose (GObject *object)
 	NMModemOfono *self = NM_MODEM_OFONO (object);
 	NMModemOfonoPrivate *priv = NM_MODEM_OFONO_GET_PRIVATE (self);
 
+	nm_clear_g_cancellable (&priv->connman_proxy_cancellable);
 	nm_clear_g_cancellable (&priv->sim_proxy_cancellable);
 
 	if (priv->connect_properties) {
@@ -1215,7 +1251,11 @@ dispose (GObject *object)
 		g_clear_object (&priv->modem_proxy);
 	}
 
-	g_clear_object (&priv->connman_proxy);
+	if (priv->connman_proxy) {
+		g_signal_handlers_disconnect_by_data (priv->connman_proxy, self);
+		g_clear_object (&priv->connman_proxy);
+	}
+
 	g_clear_object (&priv->context_proxy);
 
 	if (priv->sim_proxy) {