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-rw-r--r--drivers/net/loopback.c13
-rw-r--r--include/linux/netdevice.h1
-rw-r--r--net/core/dev.c12
3 files changed, 15 insertions, 11 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 91d08585a6d8..c4516b580ba5 100644
--- a/drivers/net/loopback.c
+++ b/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);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index f1b0dbe58464..12d7f4469dc9 100644
--- a/include/linux/netdevice.h
+++ b/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 */
diff --git a/net/core/dev.c b/net/core/dev.c
index 9475f3e624a8..811507c39805 100644
--- a/net/core/dev.c
+++ b/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;