igmp: RCU conversion of in_dev->mc_list

in_dev->mc_list is protected by one rwlock (in_dev->mc_list_lock).

This can easily be converted to a RCU protection.

Writers hold RTNL, so mc_list_lock is removed, not replaced by a
spinlock.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Cypher Wu <cypher.w@gmail.com>
Cc: Américo Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 1989cfd7405f..8945f9fb192a 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -141,7 +141,7 @@ struct inet_sock {
                                 nodefrag:1;
         int                     mc_index;
         __be32                  mc_addr;
-        struct ip_mc_socklist   *mc_list;
+        struct ip_mc_socklist __rcu     *mc_list;
         struct {
                 unsigned int            flags;
                 unsigned int            fragsize;