ipv6: remove ipv6_sk_ac_lock

Just move rtnl lock up, so that the anycast list can be protected
by rtnl lock now.

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 3b0429b..d10f2e2 100644 (file)
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -46,10 +46,6 @@
 
 static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr);
 
-/* Big ac list lock for all the sockets */
-static DEFINE_SPINLOCK(ipv6_sk_ac_lock);
-
-
 /*
  *     socket join an anycast group
  */
@@ -128,10 +124,8 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 
        err = ipv6_dev_ac_inc(dev, addr);
        if (!err) {
-               spin_lock_bh(&ipv6_sk_ac_lock);
                pac->acl_next = np->ipv6_ac_list;
                np->ipv6_ac_list = pac;
-               spin_unlock_bh(&ipv6_sk_ac_lock);
                pac = NULL;
        }
 
@@ -152,7 +146,7 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
        struct ipv6_ac_socklist *pac, *prev_pac;
        struct net *net = sock_net(sk);
 
-       spin_lock_bh(&ipv6_sk_ac_lock);
+       rtnl_lock();
        prev_pac = NULL;
        for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
                if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
@@ -161,7 +155,7 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
                prev_pac = pac;
        }
        if (!pac) {
-               spin_unlock_bh(&ipv6_sk_ac_lock);
+               rtnl_unlock();
                return -ENOENT;
        }
        if (prev_pac)
@@ -169,9 +163,6 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
        else
                np->ipv6_ac_list = pac->acl_next;
 
-       spin_unlock_bh(&ipv6_sk_ac_lock);
-
-       rtnl_lock();
        dev = __dev_get_by_index(net, pac->acl_ifindex);
        if (dev)
                ipv6_dev_ac_dec(dev, &pac->acl_addr);
@@ -192,13 +183,11 @@ void ipv6_sock_ac_close(struct sock *sk)
        if (!np->ipv6_ac_list)
                return;
 
-       spin_lock_bh(&ipv6_sk_ac_lock);
+       rtnl_lock();
        pac = np->ipv6_ac_list;
        np->ipv6_ac_list = NULL;
-       spin_unlock_bh(&ipv6_sk_ac_lock);
 
        prev_index = 0;
-       rtnl_lock();
        while (pac) {
                struct ipv6_ac_socklist *next = pac->acl_next;