quoted

  static void dwmac1000_core_init(struct mac_device_info *hw,
  				struct net_device *dev)

You should be able to remove the net_device reference here since we do 
not use it anymore after the removal of netdev_uses_dsa() or 
de-referencing of priv.

That's true for dwmac1000_core_init(). However, dwmac4_core_init() is
using priv now for some timestamping waitqueue initialization.

Thanks,
Kurt