int err = 0;
struct sky2_port *sky2 = netdev_priv(dev); struct sky2_hw *hw = sky2->hw; int err; u16 ctl, mode;
static int sky2_change_mtu(struct net_device *dev, int new_mtu){	int err = 0;	if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)		return -EINVAL;	if (netif_running(dev))		sky2_down(dev);	dev->mtu = new_mtu;	if (netif_running(dev))		err = sky2_up(dev);	return err;}