[NETNS]: Add netns refcnt debug for network devices.
dev_set_net is called for
- just allocated devices
- devices moving from one namespace to another
release_net has proper check inside to distinguish these cases.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 8b17ed4..7c1d446 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -758,7 +758,8 @@
void dev_net_set(struct net_device *dev, struct net *net)
{
#ifdef CONFIG_NET_NS
- dev->nd_net = net;
+ release_net(dev->nd_net);
+ dev->nd_net = hold_net(net);
#endif
}
diff --git a/net/core/dev.c b/net/core/dev.c
index 7aa0112..77530e9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4042,6 +4042,8 @@
*/
void free_netdev(struct net_device *dev)
{
+ release_net(dev_net(dev));
+
/* Compatibility with error handling in drivers */
if (dev->reg_state == NETREG_UNINITIALIZED) {
kfree((char *)dev - dev->padded);