l2tp: avoid to use synchronize_rcu in tunnel free function

Avoid to use synchronize_rcu in l2tp_tunnel_free because context may be
atomic.

Signed-off-by: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 393355d37b47..513cab08a986 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1347,11 +1347,10 @@ static void l2tp_tunnel_free(struct l2tp_tunnel *tunnel)
         /* Remove from tunnel list */
         spin_lock_bh(&pn->l2tp_tunnel_list_lock);
         list_del_rcu(&tunnel->list);
+        kfree_rcu(tunnel, rcu);
         spin_unlock_bh(&pn->l2tp_tunnel_list_lock);
-        synchronize_rcu();
 
         atomic_dec(&l2tp_tunnel_count);
-        kfree(tunnel);
 }
 
 /* Create a socket for the tunnel, if one isn't set up by
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index a38ec6cdeee1..56d583e083a7 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -163,6 +163,7 @@ struct l2tp_tunnel_cfg {
 
 struct l2tp_tunnel {
         int                     magic;          /* Should be L2TP_TUNNEL_MAGIC */
+        struct rcu_head rcu;
         rwlock_t                hlist_lock;     /* protect session_hlist */
         struct hlist_head       session_hlist[L2TP_HASH_SIZE];
                                                 /* hashed list of sessions,