netns: Fix device renaming for sysfs

When a netdev is moved across namespaces with the
'dev_change_net_namespace' function, the 'device_rename' function is
used to fixup kobject and refresh the sysfs tree. The device_rename
function will call kobject_rename and this one will check if there is
an object with the same name and this is the case because we are
renaming the object with the same name.

The use of 'device_rename' seems for me wrong because we usually don't
rename it but just move it across namespaces. As we just want to do a
mini "netdev_[un]register", IMO the functions
'netdev_[un]register_kobject' should be used instead, like an usual
network device [un]registering.

This patch replace device_rename by netdev_unregister_kobject,
followed by netdev_register_kobject.

The netdev_register_kobject will call device_initialize and will raise
a warning indicating the device was already initialized. In order to
fix that, I split the device initialization into a separate function
and use it together with 'netdev_register_kobject' into
register_netdevice. So we can safely call 'netdev_register_kobject' in
'dev_change_net_namespace'.

This fix will allow to properly use the sysfs per namespace which is
coming from -mm tree.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -3776,6 +3776,7 @@ int register_netdevice(struct net_device *dev)
 		}
 	}
 
+	netdev_initialize_kobject(dev);
 	ret = netdev_register_kobject(dev);
 	if (ret)
 		goto err_uninit;
@@ -4208,7 +4209,8 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
 	}
 
 	/* Fixup kobjects */
-	err = device_rename(&dev->dev, dev->name);
+	netdev_unregister_kobject(dev);
+	err = netdev_register_kobject(dev);
 	WARN_ON(err);
 
 	/* Add the device back in the hashes */

net/core/net-sysfs.c

@@ -449,7 +449,6 @@ int netdev_register_kobject(struct net_device *net)
 	struct device *dev = &(net->dev);
 	struct attribute_group **groups = net->sysfs_groups;
 
-	device_initialize(dev);
 	dev->class = &net_class;
 	dev->platform_data = net;
 	dev->groups = groups;
@@ -470,6 +469,12 @@ int netdev_register_kobject(struct net_device *net)
 	return device_add(dev);
 }
 
+void netdev_initialize_kobject(struct net_device *net)
+{
+	struct device *device = &(net->dev);
+	device_initialize(device);
+}
+
 int netdev_kobject_init(void)
 {
 	return class_register(&net_class);

net/core/net-sysfs.h

@@ -4,5 +4,5 @@
 int netdev_kobject_init(void);
 int netdev_register_kobject(struct net_device *);
 void netdev_unregister_kobject(struct net_device *);
-
+void netdev_initialize_kobject(struct net_device *);
 #endif