inetpeer: fix a race in inetpeer_gc_worker()

[pandora-kernel.git] / net / ipv4 / inetpeer.c

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index d77a7dd..552e4f8 100644 (file)
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -560,6 +560,17 @@ bool inet_peer_xrlim_allow(struct inet_peer *peer, int timeout)
 }
 EXPORT_SYMBOL(inet_peer_xrlim_allow);
 
+static void inetpeer_inval_rcu(struct rcu_head *head)
+{
+       struct inet_peer *p = container_of(head, struct inet_peer, gc_rcu);
+
+       spin_lock_bh(&gc_lock);
+       list_add_tail(&p->gc_list, &gc_list);
+       spin_unlock_bh(&gc_lock);
+
+       schedule_delayed_work(&gc_work, gc_delay);
+}
+
 void inetpeer_invalidate_tree(int family)
 {
        struct inet_peer *old, *new, *prev;
@@ -576,10 +587,7 @@ void inetpeer_invalidate_tree(int family)
        prev = cmpxchg(&base->root, old, new);
        if (prev == old) {
                base->total = 0;
-               spin_lock(&gc_lock);
-               list_add_tail(&prev->gc_list, &gc_list);
-               spin_unlock(&gc_lock);
-               schedule_delayed_work(&gc_work, gc_delay);
+               call_rcu(&prev->gc_rcu, inetpeer_inval_rcu);
        }
 
 out: