static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
 {
-	struct usbnet *dev = netdev_priv(netdev);
-
 	if (!netif_running(netdev))
 		return -EINVAL;
 
-	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
+	return usbnet_mii_ioctl(netdev, rq, cmd);
 }

You are doing the same as phy_do_ioctl(), but for the old mii
code. However, we also have phy_do_ioctl_running(). It might make
sense to add usbnet_mii_ioctl_running()?

	Andrew