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net: add a pre-check of net_ns in sk_change_net()

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We do not need to switch the net_ns if the target net_ns the same
as the current one, so here we add a pre-check of net_ns to avoid
this as David suggested.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gu Zheng 2014-03-10 09:57:34 +08:00 committed by David S. Miller
parent 431a91242d
commit 5812521be0
1 changed files with 6 additions and 2 deletions
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8
include/net/sock.h
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@ -2252,8 +2252,12 @@ void sock_net_set(struct sock *sk, struct net *net)
*/
static inline void sk_change_net(struct sock *sk, struct net *net)
{
put_net(sock_net(sk));
sock_net_set(sk, hold_net(net));
struct net *current_net = sock_net(sk);
if (!net_eq(current_net, net)) {
put_net(current_net);
sock_net_set(sk, hold_net(net));
}
}
static inline struct sock *skb_steal_sock(struct sk_buff *skb)