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authorEric W. Biederman <ebiederm@aristanetworks.com>2009-02-22 11:11:09 +0300
committerDavid S. Miller <davem@davemloft.net>2009-03-03 12:14:27 +0300
commit17edde520927070a6bf14a6a75027c0b843443e5 (patch)
treedcd940213c93bc943c670f48aa52ec8571351912 /net
parent2f20d2e667ab1ca44cde5fb361386dff5bb6081d (diff)
downloadlinux-17edde520927070a6bf14a6a75027c0b843443e5.tar.xz
netns: Remove net_alive
It turns out that net_alive is unnecessary, and the original problem that led to it being added was simply that the icmp code thought it was a network device and wound up being unable to handle packets while there were still packets in the network namespace. Now that icmp and tcp have been fixed to properly register themselves this problem is no longer present and we have a stronger guarantee that packets will not arrive in a network namespace then that provided by net_alive in netif_receive_skb. So remove net_alive allowing packet reception run a little faster. Additionally document the strong reason why network namespace cleanup is safe so that if something happens again someone else will have a chance of figuring it out. Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c6
-rw-r--r--net/core/net_namespace.c3
2 files changed, 0 insertions, 9 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 72b0d26fd46d..9e4afe650e7a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2267,12 +2267,6 @@ int netif_receive_skb(struct sk_buff *skb)
rcu_read_lock();
- /* Don't receive packets in an exiting network namespace */
- if (!net_alive(dev_net(skb->dev))) {
- kfree_skb(skb);
- goto out;
- }
-
#ifdef CONFIG_NET_CLS_ACT
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2adb1a7d361f..e3bebd36f053 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -157,9 +157,6 @@ static void cleanup_net(struct work_struct *work)
struct pernet_operations *ops;
struct net *net;
- /* Be very certain incoming network packets will not find us */
- rcu_barrier();
-
net = container_of(work, struct net, work);
mutex_lock(&net_mutex);