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Diffstat (limited to 'net/ipv6/protocol.c')
-rw-r--r--net/ipv6/protocol.c32
1 files changed, 4 insertions, 28 deletions
diff --git a/net/ipv6/protocol.c b/net/ipv6/protocol.c
index 1fa3468f0f32..9bb936ae2452 100644
--- a/net/ipv6/protocol.c
+++ b/net/ipv6/protocol.c
@@ -25,28 +25,14 @@
#include <linux/spinlock.h>
#include <net/protocol.h>
-const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS];
-static DEFINE_SPINLOCK(inet6_proto_lock);
-
+const struct inet6_protocol *inet6_protos[MAX_INET_PROTOS] __read_mostly;
int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
{
- int ret, hash = protocol & (MAX_INET_PROTOS - 1);
-
- spin_lock_bh(&inet6_proto_lock);
-
- if (inet6_protos[hash]) {
- ret = -1;
- } else {
- inet6_protos[hash] = prot;
- ret = 0;
- }
-
- spin_unlock_bh(&inet6_proto_lock);
+ int hash = protocol & (MAX_INET_PROTOS - 1);
- return ret;
+ return !cmpxchg(&inet6_protos[hash], NULL, prot) ? 0 : -1;
}
-
EXPORT_SYMBOL(inet6_add_protocol);
/*
@@ -57,20 +43,10 @@ int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol
{
int ret, hash = protocol & (MAX_INET_PROTOS - 1);
- spin_lock_bh(&inet6_proto_lock);
-
- if (inet6_protos[hash] != prot) {
- ret = -1;
- } else {
- inet6_protos[hash] = NULL;
- ret = 0;
- }
-
- spin_unlock_bh(&inet6_proto_lock);
+ ret = (cmpxchg(&inet6_protos[hash], prot, NULL) == prot) ? 0 : -1;
synchronize_net();
return ret;
}
-
EXPORT_SYMBOL(inet6_del_protocol);