net/ucc_geth: allow to set mac address on running device

Inspired by the patch for 8139too (bda6a15).

Currently we can't set mac address on a running ucc_geth device.
But this is needed when you use this device as a bonding slave in
bonding device in balance-alb mode. So add this feature for ucc_geth
device.

Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ucc_geth.c

@@ -3325,6 +3325,37 @@ static void ucc_netpoll(struct net_device *dev)
 }
 #endif /* CONFIG_NET_POLL_CONTROLLER */
 
+static int ucc_geth_set_mac_addr(struct net_device *dev, void *p)
+{
+	struct ucc_geth_private *ugeth = netdev_priv(dev);
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+	/*
+	 * If device is not running, we will set mac addr register
+	 * when opening the device.
+	 */
+	if (!netif_running(dev))
+		return 0;
+
+	spin_lock_irq(&ugeth->lock);
+	init_mac_station_addr_regs(dev->dev_addr[0],
+				   dev->dev_addr[1],
+				   dev->dev_addr[2],
+				   dev->dev_addr[3],
+				   dev->dev_addr[4],
+				   dev->dev_addr[5],
+				   &ugeth->ug_regs->macstnaddr1,
+				   &ugeth->ug_regs->macstnaddr2);
+	spin_unlock_irq(&ugeth->lock);
+
+	return 0;
+}
+
 /* Called when something needs to use the ethernet device */
 /* Returns 0 for success. */
 static int ucc_geth_open(struct net_device *dev)
@@ -3501,7 +3532,7 @@ static const struct net_device_ops ucc_geth_netdev_ops = {
 	.ndo_stop		= ucc_geth_close,
 	.ndo_start_xmit		= ucc_geth_start_xmit,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_set_mac_address	= ucc_geth_set_mac_addr,
 	.ndo_change_mtu		= eth_change_mtu,
 	.ndo_set_multicast_list	= ucc_geth_set_multi,
 	.ndo_tx_timeout		= ucc_geth_timeout,