commit fa0879e37b59e8e3f130a30a9e6fa515717c5bdd
Author: Stefan Hajnoczi <stefanha@gmail.com>
Date:   Mon Jan 21 01:17:22 2013 +0000

    net: split eth_mac_addr for better error handling
    
    When we set mac address, software mac address in system and hardware mac
    address all need to be updated. Current eth_mac_addr() doesn't allow
    callers to implement error handling nicely.
    
    This patch split eth_mac_addr() to prepare part and real commit part,
    then we can prepare first, and try to change hardware address, then do
    the real commit if hardware address is set successfully.
    
    Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
    Signed-off-by: Amos Kong <akong@redhat.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>

--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -40,6 +40,8 @@ extern int eth_header_cache(const struct
 extern void eth_header_cache_update(struct hh_cache *hh,
 				    const struct net_device *dev,
 				    const unsigned char *haddr);
+extern int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
+extern void eth_commit_mac_addr_change(struct net_device *dev, void *p);
 extern int eth_mac_addr(struct net_device *dev, void *p);
 extern int eth_change_mtu(struct net_device *dev, int new_mtu);
 extern int eth_validate_addr(struct net_device *dev);
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -278,16 +278,11 @@ void eth_header_cache_update(struct hh_c
 EXPORT_SYMBOL(eth_header_cache_update);
 
 /**
- * eth_mac_addr - set new Ethernet hardware address
+ * eth_prepare_mac_addr_change - prepare for mac change
  * @dev: network device
  * @p: socket address
- *
- * Change hardware address of device.
- *
- * This doesn't change hardware matching, so needs to be overridden
- * for most real devices.
  */
-int eth_mac_addr(struct net_device *dev, void *p)
+int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
 {
 	struct sockaddr *addr = p;
 
@@ -295,9 +290,43 @@ int eth_mac_addr(struct net_device *dev,
 		return -EBUSY;
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
+	return 0;
+}
+EXPORT_SYMBOL(eth_prepare_mac_addr_change);
+
+/**
+ * eth_commit_mac_addr_change - commit mac change
+ * @dev: network device
+ * @p: socket address
+ */
+void eth_commit_mac_addr_change(struct net_device *dev, void *p)
+{
+	struct sockaddr *addr = p;
+
 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 	/* if device marked as NET_ADDR_RANDOM, reset it */
 	dev->addr_assign_type &= ~NET_ADDR_RANDOM;
+}
+EXPORT_SYMBOL(eth_commit_mac_addr_change);
+
+/**
+ * eth_mac_addr - set new Ethernet hardware address
+ * @dev: network device
+ * @p: socket address
+ *
+ * Change hardware address of device.
+ *
+ * This doesn't change hardware matching, so needs to be overridden
+ * for most real devices.
+ */
+int eth_mac_addr(struct net_device *dev, void *p)
+{
+	int ret;
+
+	ret = eth_prepare_mac_addr_change(dev, p);
+	if (ret < 0)
+		return ret;
+	eth_commit_mac_addr_change(dev, p);
 	return 0;
 }
 EXPORT_SYMBOL(eth_mac_addr);