--- a/drivers/net/au1000_eth.c
+++ b/drivers/net/au1000_eth.c
@@ -1306,9 +1306,12 @@
 	}
 }
 
+#define AU1000_KNOWN_PHY_IOCTLS 		(SIOCGMIIPHY & 0xfff0)
 static int au1000_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 {
 	struct au1000_private *aup = (struct au1000_private *)dev->priv;
+	if((cmd & AU1000_KNOWN_PHY_IOCTLS) != AU1000_KNOWN_PHY_IOCTLS)
+		return -EINVAL;
 
 	if (!netif_running(dev)) return -EINVAL;
 
