netdev_change_features — recalculate device features
| void netdev_change_features ( | struct net_device * dev ); | 
   Recalculate dev->features set and send notifications even
   if they have not changed. Should be called instead of
   netdev_update_features if also dev->vlan_features might
   have changed to allow the changes to be propagated to stacked
   VLAN devices.