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tunnels: add _rcu annotations

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(struct ip6_tnl)->next is rcu protected :
(struct ip_tunnel)->next is rcu protected :
(struct xfrm6_tunnel)->next is rcu protected :

add __rcu annotation and proper rcu primitives.

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2010-10-24 21:33:16 +00:00 • committed by David S. Miller
commit 6f0bcf1525
5 changed files with 21 additions and 14 deletions
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5
net/ipv4/gre.c
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@ -22,7 +22,7 @@
#include <net/gre.h>
static const struct gre_protocol *gre_proto[GREPROTO_MAX] __read_mostly;
static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
static DEFINE_SPINLOCK(gre_proto_lock);
int gre_add_protocol(const struct gre_protocol *proto, u8 version)
@ -51,7 +51,8 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version)
goto err_out;
spin_lock(&gre_proto_lock);
if (gre_proto[version] != proto)
if (rcu_dereference_protected(gre_proto[version],
lockdep_is_held(&gre_proto_lock)) != proto)
goto err_out_unlock;
rcu_assign_pointer(gre_proto[version], NULL);
spin_unlock(&gre_proto_lock);