From: Denis V. Lunev <den@openvz.org>
Date: Wed, 16 Apr 2008 09:02:18 +0000 (-0700)
Subject: [NETNS]: Add netns refcnt debug for network devices.
X-Git-Tag: v2.6.26-rc1~1138^2~15
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=f3005d7f4abe03ad41af33b1548602cd086d86a2;p=~shefty%2Frdma-dev.git

[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 8b17ed40dea..7c1d4466583 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -758,7 +758,8 @@ static inline
 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 7aa01125287..77530e9a34f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4042,6 +4042,8 @@ EXPORT_SYMBOL(alloc_netdev_mq);
  */
 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);