[PATCH -mm 4/9] netconsole: Introduce netconsole_netdev_notifier

@@ -81,6 +81,37 @@ static struct netconsole_target default_
 	},
 };
 
+/* Handle network interface device notifications */
+static int netconsole_netdev_event(struct notifier_block *this,
+				   unsigned long event,
+				   void *ptr)
+{
+	struct net_device *dev = ptr;
+	struct netconsole_target *nt = &default_target;
+
+	if (!(event == NETDEV_CHANGEADDR || event == NETDEV_CHANGENAME))
+		goto done;
+
+	if (nt->np.dev == dev) {
+		switch (event) {
+		case NETDEV_CHANGEADDR:
+			memcpy(nt->np.local_mac, dev->dev_addr, ETH_ALEN);
+			break;
+
+		case NETDEV_CHANGENAME:
+			strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ);
+			break;
+		}
+	}
+
+done:
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block netconsole_netdev_notifier = {
+	.notifier_call  = netconsole_netdev_event,
+};
+
 static void write_msg(struct console *con, const char *msg, unsigned int len)
 {
 	int frag, left;

@@ -123,6 +154,10 @@ static int __init init_netconsole(void)
 	if (err)
 		goto out;
 
+	err = register_netdevice_notifier(&netconsole_netdev_notifier);
+	if (err)
+		return err;
+
 	register_console(&netconsole);
 	printk(KERN_INFO "netconsole: network logging started\n");
 

@@ -135,6 +170,7 @@ static void __exit cleanup_netconsole(vo
 	struct netconsole_target *nt = &default_target;
 
 	unregister_console(&netconsole);
+	unregister_netdevice_notifier(&netconsole_netdev_notifier);
 	netpoll_cleanup(&nt->np);
 }