[PATCH] : net/core: move set MAC into separate function

	This moves the SIOCSIFHWADDR code from dev_ifsioc() into a
separate new function, dev_set_mac_address().  This provides a single
entry point for all callers performing MAC address changes.
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

include/linux/netdevice.h

@@ -678,6 +678,8 @@ extern unsigned		dev_get_flags(const struct net_device *);
 extern int		dev_change_flags(struct net_device *, unsigned);
 extern int		dev_change_name(struct net_device *, char *);
 extern int		dev_set_mtu(struct net_device *, int);
+extern int		dev_set_mac_address(struct net_device *,
+					    struct sockaddr *);
 extern void		dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 
 extern void		dev_init(void);

net/core/dev.c

@@ -2300,6 +2300,21 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
 	return err;
 }
 
+int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
+{
+	int err;
+
+	if (!dev->set_mac_address)
+		return -EOPNOTSUPP;
+	if (sa->sa_family != dev->type)
+		return -EINVAL;
+	if (!netif_device_present(dev))
+		return -ENODEV;
+	err = dev->set_mac_address(dev, sa);
+	if (!err)
+		notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
+	return err;
+}
 
 /*
  *	Perform the SIOCxIFxxx calls.
@@ -2346,17 +2361,7 @@ static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
 			return 0;
 
 		case SIOCSIFHWADDR:
-			if (!dev->set_mac_address)
-				return -EOPNOTSUPP;
-			if (ifr->ifr_hwaddr.sa_family != dev->type)
-				return -EINVAL;
-			if (!netif_device_present(dev))
-				return -ENODEV;
-			err = dev->set_mac_address(dev, &ifr->ifr_hwaddr);
-			if (!err)
-				notifier_call_chain(&netdev_chain,
-						    NETDEV_CHANGEADDR, dev);
-			return err;
+			return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
 
 		case SIOCSIFHWBROADCAST:
 			if (ifr->ifr_hwaddr.sa_family != dev->type)
@@ -3322,6 +3327,7 @@ EXPORT_SYMBOL(dev_set_allmulti);
 EXPORT_SYMBOL(dev_set_promiscuity);
 EXPORT_SYMBOL(dev_change_flags);
 EXPORT_SYMBOL(dev_set_mtu);
+EXPORT_SYMBOL(dev_set_mac_address);
 EXPORT_SYMBOL(free_netdev);
 EXPORT_SYMBOL(netdev_boot_setup_check);
 EXPORT_SYMBOL(netdev_set_master);