From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrei Vagin Subject: [PATCH] net: use net->count to check whether a netns is alive or not Date: Sun, 12 Mar 2017 21:36:18 -0700 Message-ID: <20170313043618.16183-1-avagin@openvz.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: netdev@vger.kernel.org, =?UTF-8?q?Mantas=20Mikul=C4=97nas?= , stable@vger.kernel.org, Andrei Vagin To: "David S. Miller" Return-path: Sender: stable-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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. Reported-by: Mantas Mikulėnas Fixes: 002d8a1a6c11 ("net: skip genenerating uevents for network namespaces that are exiting") Signed-off-by: Andrei Vagin --- net/core/net-sysfs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index b0c04cf..1004418 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -952,7 +952,7 @@ net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 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_device *dev, int old_num, int new_num) 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 net_device *ndev) { 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); -- 2.9.3