---

yaml
---
r: 314525
b: refs/heads/master
c: da55737
h: refs/heads/master
i:
  314523: e1ff58e
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6dab015cf8c9d2fabb13d0332998bc440e9c6555
+refs/heads/master: da55737467c1c3bc02271039c088171d82e0796f

trunk/net/ipv4/inetpeer.c

@@ -126,7 +126,7 @@ int inet_peer_maxttl __read_mostly = 10 * 60 * HZ;	/* usual time to live: 10 min
 
 static void inetpeer_gc_worker(struct work_struct *work)
 {
-	struct inet_peer *p, *n;
+	struct inet_peer *p, *n, *c;
 	LIST_HEAD(list);
 
 	spin_lock_bh(&gc_lock);
@@ -138,17 +138,19 @@ static void inetpeer_gc_worker(struct work_struct *work)
 
 	list_for_each_entry_safe(p, n, &list, gc_list) {
 
-		if(need_resched())
+		if (need_resched())
 			cond_resched();
 
-		if (p->avl_left != peer_avl_empty) {
-			list_add_tail(&p->avl_left->gc_list, &list);
-			p->avl_left = peer_avl_empty;
+		c = rcu_dereference_protected(p->avl_left, 1);
+		if (c != peer_avl_empty) {
+			list_add_tail(&c->gc_list, &list);
+			p->avl_left = peer_avl_empty_rcu;
 		}
 
-		if (p->avl_right != peer_avl_empty) {
-			list_add_tail(&p->avl_right->gc_list, &list);
-			p->avl_right = peer_avl_empty;
+		c = rcu_dereference_protected(p->avl_right, 1);
+		if (c != peer_avl_empty) {
+			list_add_tail(&c->gc_list, &list);
+			p->avl_right = peer_avl_empty_rcu;
 		}
 
 		n = list_entry(p->gc_list.next, struct inet_peer, gc_list);
@@ -587,23 +589,17 @@ static void inetpeer_inval_rcu(struct rcu_head *head)
 
 void inetpeer_invalidate_tree(struct inet_peer_base *base)
 {
-	struct inet_peer *old, *new, *prev;
+	struct inet_peer *root;
 
 	write_seqlock_bh(&base->lock);
 
-	old = base->root;
-	if (old == peer_avl_empty_rcu)
-		goto out;
-
-	new = peer_avl_empty_rcu;
-
-	prev = cmpxchg(&base->root, old, new);
-	if (prev == old) {
+	root = rcu_deref_locked(base->root, base);
+	if (root != peer_avl_empty) {
+		base->root = peer_avl_empty_rcu;
 		base->total = 0;
-		call_rcu(&prev->gc_rcu, inetpeer_inval_rcu);
+		call_rcu(&root->gc_rcu, inetpeer_inval_rcu);
 	}
 
-out:
 	write_sequnlock_bh(&base->lock);
 }
 EXPORT_SYMBOL(inetpeer_invalidate_tree);