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authorFlorian Westphal <fw@strlen.de>2016-08-11 15:17:56 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2016-08-12 08:07:12 +0200
commita7c44247f704e385c77579d65c6ee6d002832529 (patch)
tree8937a83226c46ffe7ace1a3817d76b943b1f3c6b
parente37cc8ade5afaf082f804c6d18eb23377146bec4 (diff)
downloadlinux-a7c44247f704e385c77579d65c6ee6d002832529.tar.bz2
xfrm: policy: make xfrm_policy_lookup_bytype lockless
side effect: no longer disables BH (should be fine). Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
-rw-r--r--include/net/netns/xfrm.h2
-rw-r--r--net/xfrm/xfrm_policy.c4
2 files changed, 3 insertions, 3 deletions
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index 1ab51d188408..3ab828a97e68 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -11,7 +11,7 @@
struct ctl_table_header;
struct xfrm_policy_hash {
- struct hlist_head *table;
+ struct hlist_head __rcu *table;
unsigned int hmask;
u8 dbits4;
u8 sbits4;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 09f2e2b38246..9302647f20a0 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1123,7 +1123,7 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
if (unlikely(!daddr || !saddr))
return NULL;
- read_lock_bh(&net->xfrm.xfrm_policy_lock);
+ rcu_read_lock();
retry:
do {
sequence = read_seqcount_begin(&xfrm_policy_hash_generation);
@@ -1172,7 +1172,7 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
if (ret && !xfrm_pol_hold_rcu(ret))
goto retry;
fail:
- read_unlock_bh(&net->xfrm.xfrm_policy_lock);
+ rcu_read_unlock();
return ret;
}