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net_ns: add __rcu annotations

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add __rcu annotation to (struct net)->gen, and use
rcu_dereference_protected() in net_assign_generic()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-10-25 03:20:11 +00:00 committed by David S. Miller
parent 6e3f7faf3e
commit 1c87733d06
2 changed files with 4 additions and 2 deletions
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2
include/net/net_namespace.h
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@ -88,7 +88,7 @@ struct net {
#ifdef CONFIG_WEXT_CORE
struct sk_buff_head wext_nlevents;
#endif
struct net_generic *gen;
struct net_generic __rcu *gen;
/* Note : following structs are cache line aligned */
#ifdef CONFIG_XFRM

4
net/core/net_namespace.c
View file

@ -42,7 +42,9 @@ static int net_assign_generic(struct net *net, int id, void *data)
BUG_ON(!mutex_is_locked(&net_mutex));
BUG_ON(id == 0);
ng = old_ng = net->gen;
old_ng = rcu_dereference_protected(net->gen,
lockdep_is_held(&net_mutex));
ng = old_ng;
if (old_ng->len >= id)
goto assign;