ipv6 anycast: Convert ipv6_sk_ac_lock to spinlock.

Since all users are write-lock, it does not make sense to use
rwlock here.  Use simple spinlock.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 8 deletions

diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 757a810d8f15..921b8b398a8c 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -47,7 +47,7 @@
 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_RWLOCK(ipv6_sk_ac_lock);
+static DEFINE_SPINLOCK(ipv6_sk_ac_lock);
 
 
 /*
@@ -128,10 +128,10 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 
         err = ipv6_dev_ac_inc(dev, addr);
         if (!err) {
-                write_lock_bh(&ipv6_sk_ac_lock);
+                spin_lock_bh(&ipv6_sk_ac_lock);
                 pac->acl_next = np->ipv6_ac_list;
                 np->ipv6_ac_list = pac;
-                write_unlock_bh(&ipv6_sk_ac_lock);
+                spin_unlock_bh(&ipv6_sk_ac_lock);
                 pac = NULL;
         }
 
@@ -152,7 +152,7 @@ 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);
 
-        write_lock_bh(&ipv6_sk_ac_lock);
+        spin_lock_bh(&ipv6_sk_ac_lock);
         prev_pac = NULL;
         for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {
                 if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&
@@ -161,7 +161,7 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
                 prev_pac = pac;
         }
         if (!pac) {
-                write_unlock_bh(&ipv6_sk_ac_lock);
+                spin_unlock_bh(&ipv6_sk_ac_lock);
                 return -ENOENT;
         }
         if (prev_pac)
@@ -169,7 +169,7 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
         else
                 np->ipv6_ac_list = pac->acl_next;
 
-        write_unlock_bh(&ipv6_sk_ac_lock);
+        spin_unlock_bh(&ipv6_sk_ac_lock);
 
         rcu_read_lock();
         dev = dev_get_by_index_rcu(net, pac->acl_ifindex);
@@ -192,10 +192,10 @@ void ipv6_sock_ac_close(struct sock *sk)
         if (!np->ipv6_ac_list)
                 return;
 
-        write_lock_bh(&ipv6_sk_ac_lock);
+        spin_lock_bh(&ipv6_sk_ac_lock);
         pac = np->ipv6_ac_list;
         np->ipv6_ac_list = NULL;
-        write_unlock_bh(&ipv6_sk_ac_lock);
+        spin_unlock_bh(&ipv6_sk_ac_lock);
 
         prev_index = 0;
         rcu_read_lock();