smsc75xx: only set mac address once on bind

This patch changes when we decide what the device's MAC address
is from per ifconfig up to once when the device is connected.

Without this patch, a manually forced device MAC is overwritten
on ifconfig down/up.  Also devices that have no EEPROM are
assigned a new random address on ifconfig down/up instead of
persisting the same one.
Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Reported-by: Robert Cunningham <rcunningham@nsmsurveillance.com>
Cc: Bjorn Mork <bjorn@mork.no>
Cc: Dan Williams <dcbw@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/smsc75xx.c

@@ -1054,8 +1054,6 @@ static int smsc75xx_reset(struct usbnet *dev)
 
 	netif_dbg(dev, ifup, dev->net, "PHY reset complete\n");
 
-	smsc75xx_init_mac_address(dev);
-
 	ret = smsc75xx_set_mac_address(dev);
 	if (ret < 0) {
 		netdev_warn(dev->net, "Failed to set mac address\n");
@@ -1422,6 +1420,14 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
 	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 		NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_RXCSUM;
 
+	ret = smsc75xx_wait_ready(dev, 0);
+	if (ret < 0) {
+		netdev_warn(dev->net, "device not ready in smsc75xx_bind\n");
+		return ret;
+	}
+
+	smsc75xx_init_mac_address(dev);
+
 	/* Init all registers */
 	ret = smsc75xx_reset(dev);
 	if (ret < 0) {