modem: ensure device is deactivated if the modem is disabled underneath NM

src/modem-manager/nm-modem.c

@@ -596,8 +596,17 @@ modem_properties_changed (DBusGProxy *proxy,
 
 	value = g_hash_table_lookup (props, "Enabled");
 	if (value && G_VALUE_HOLDS_BOOLEAN (value)) {
+		NMDeviceState state;
+
 		priv->mm_enabled = g_value_get_boolean (value);
 		g_object_notify (G_OBJECT (self), NM_MODEM_ENABLED);
+
+		state = nm_device_interface_get_state (NM_DEVICE_INTERFACE (self));
+		if (IS_ACTIVATING_STATE (state) || (state == NM_DEVICE_STATE_ACTIVATED)) {
+			nm_device_state_changed (NM_DEVICE (self),
+			                         NM_DEVICE_STATE_DISCONNECTED,
+			                         NM_DEVICE_STATE_REASON_NONE);
+		}
 	}
 }