Comment # 28 on bug 927677 from Franck Bui

(In reply to Dominique Leuenberger from comment #27)
> We should probably know what the return value was though... only then can we
> know what udisks2 interprets out of the udev call

I think it doesn't really matter as long as a parent is returned by the
function.

>From set_connection_bus(), in udiskslinuxdrive.c:

  parent = g_udev_device_get_parent_with_subsystem (device->udev_device, "usb",
"usb_interface");
  if (parent != NULL)
    {
      /* TODO: should probably check that it's a storage interface */
      udisks_drive_set_connection_bus (iface, "usb");