diff options
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; |