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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-25 21:01:26 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-10-27 11:37:32 -0700 |
| commit | b33eab08445d86c3d0dec3111ce10df561328705 (patch) | |
| tree | 381a37141d4da9cf6cb3a8c8c37c6363d856f8e4 /net | |
| parent | e0ad61ec867fdd262804afa7a68e11fc9930c2b9 (diff) | |
| download | linux-b33eab08445d86c3d0dec3111ce10df561328705.tar.bz2 | |
tunnels: add __rcu annotations
Add __rcu annotations to :
(struct ip_tunnel)->prl
(struct ip_tunnel_prl_entry)->next
(struct xfrm_tunnel)->next
struct xfrm_tunnel *tunnel4_handlers
struct xfrm_tunnel *tunnel64_handlers
And use appropriate rcu primitives to reduce sparse warnings if
CONFIG_SPARSE_RCU_POINTER=y
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tunnel4.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c index 9a17bd2a0a37..ac3b3ee4b07c 100644 --- a/net/ipv4/tunnel4.c +++ b/net/ipv4/tunnel4.c @@ -14,27 +14,32 @@ #include <net/protocol.h> #include <net/xfrm.h> -static struct xfrm_tunnel *tunnel4_handlers __read_mostly; -static struct xfrm_tunnel *tunnel64_handlers __read_mostly; +static struct xfrm_tunnel __rcu *tunnel4_handlers __read_mostly; +static struct xfrm_tunnel __rcu *tunnel64_handlers __read_mostly; static DEFINE_MUTEX(tunnel4_mutex); -static inline struct xfrm_tunnel **fam_handlers(unsigned short family) +static inline struct xfrm_tunnel __rcu **fam_handlers(unsigned short family) { return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers; } int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family) { - struct xfrm_tunnel **pprev; + struct xfrm_tunnel __rcu **pprev; + struct xfrm_tunnel *t; + int ret = -EEXIST; int priority = handler->priority; mutex_lock(&tunnel4_mutex); - for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { - if ((*pprev)->priority > priority) + for (pprev = fam_handlers(family); + (t = rcu_dereference_protected(*pprev, + lockdep_is_held(&tunnel4_mutex))) != NULL; + pprev = &t->next) { + if (t->priority > priority) break; - if ((*pprev)->priority == priority) + if (t->priority == priority) goto err; } @@ -52,13 +57,17 @@ EXPORT_SYMBOL(xfrm4_tunnel_register); int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family) { - struct xfrm_tunnel **pprev; + struct xfrm_tunnel __rcu **pprev; + struct xfrm_tunnel *t; int ret = -ENOENT; mutex_lock(&tunnel4_mutex); - for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { - if (*pprev == handler) { + for (pprev = fam_handlers(family); + (t = rcu_dereference_protected(*pprev, + lockdep_is_held(&tunnel4_mutex))) != NULL; + pprev = &t->next) { + if (t == handler) { *pprev = handler->next; ret = 0; break; |