---

yaml
---
r: 121723
b: refs/heads/master
c: ae33bc4
h: refs/heads/master
i:
  121721: 052939f
  121719: f16019f
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d0c082cea6dfb9b674b4f6e1e84025662dbd24e8
+refs/heads/master: ae33bc40c0d96d02f51a996482ea7e41c5152695

trunk/drivers/net/loopback.c

@@ -204,17 +204,8 @@ static __net_exit void loopback_net_exit(struct net *net)
 	unregister_netdev(dev);
 }
 
-static struct pernet_operations __net_initdata loopback_net_ops = {
+/* Registered in net/core/dev.c */
+struct pernet_operations __net_initdata loopback_net_ops = {
        .init = loopback_net_init,
        .exit = loopback_net_exit,
 };
-
-static int __init loopback_init(void)
-{
-	return register_pernet_device(&loopback_net_ops);
-}
-
-/* Loopback is special. It should be initialized before any other network
- * device and network subsystem.
- */
-fs_initcall(loopback_init);

trunk/include/linux/netdevice.h

@@ -1766,6 +1766,7 @@ static inline int skb_bond_should_drop(struct sk_buff *skb)
 	return 0;
 }
 
+extern struct pernet_operations __net_initdata loopback_net_ops;
 #endif /* __KERNEL__ */
 
 #endif	/* _LINUX_DEV_H */

trunk/net/core/dev.c

@@ -4904,6 +4904,18 @@ static int __init net_dev_init(void)
 	if (register_pernet_subsys(&netdev_net_ops))
 		goto out;
 
+	/* The loopback device is special if any other network devices
+	 * is present in a network namespace the loopback device must
+	 * be present. Since we now dynamically allocate and free the
+	 * loopback device ensure this invariant is maintained by
+	 * keeping the loopback device as the first device on the
+	 * list of network devices.  Ensuring the loopback devices
+	 * is the first device that appears and the last network device
+	 * that disappears.
+	 */
+	if (register_pernet_device(&loopback_net_ops))
+		goto out;
+
 	if (register_pernet_device(&default_device_ops))
 		goto out;