Patch "net: use net->count to check whether a netns is alive or not" has been added to the 4.10-stable tree

This is a note to let you know that I've just added the patch titled

    net: use net->count to check whether a netns is alive or not

to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
net-use-net-count-to-check-whether-a-netns-is-alive-or-not.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andrey Vagin <[email protected]>
Date: Sun, 12 Mar 2017 21:36:18 -0700
Subject: net: use net->count to check whether a netns is alive or not

From: Andrey Vagin <[email protected]>

[ Upstream commit 91864f5852f9996210fad400cf70fb85af091243 ]

The previous idea was to check whether a net namespace is in net_exit_list or not. It doesn't work, because net->exit_list is used in __register_pernet_operations and __unregister_pernet_operations where all namespaces are added to a temporary list to make cleanup in a error case, so list_empty(&net->exit_list) always returns false.

---
 net/core/net-sysfs.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -952,7 +952,7 @@ net_rx_queue_update_kobjects(struct net_
 	while (--i >= new_num) {
 		struct kobject *kobj = &dev->_rx[i].kobj;
 
-		if (!list_empty(&dev_net(dev)->exit_list))
+		if (!atomic_read(&dev_net(dev)->count))
 			kobj->uevent_suppress = 1;
 		if (dev->sysfs_rx_queue_group)
 			sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);

@@ -1370,7 +1370,7 @@ netdev_queue_update_kobjects(struct net_
 	while (--i >= new_num) {
 		struct netdev_queue *queue = dev->_tx + i;
 
-		if (!list_empty(&dev_net(dev)->exit_list))
+		if (!atomic_read(&dev_net(dev)->count))
 			queue->kobj.uevent_suppress = 1;
 #ifdef CONFIG_BQL
 		sysfs_remove_group(&queue->kobj, &dql_group);

@@ -1557,7 +1557,7 @@ void netdev_unregister_kobject(struct ne
 {
 	struct device *dev = &(ndev->dev);
 
-	if (!list_empty(&dev_net(ndev)->exit_list))
+	if (!atomic_read(&dev_net(ndev)->count))
 		dev_set_uevent_suppress(dev, 1);
 
 	kobject_get(&dev->kobj);

Patches currently in stable-queue which might be from [email protected] are

queue-4.10/net-use-net-count-to-check-whether-a-netns-is-alive-or-not.patch