netdev - [PATCH net-next 4/8] ipv6: if no function for cleaner is specified only visit fib6

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Date:	Sun, 21 Sep 2014 00:05:21 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Cc:	eric.dumazet@...il.com, vyasevich@...il.com,
	nicolas.dichtel@...nd.com, kafai@...com
Subject: [PATCH net-next 4/8] ipv6: if no function for cleaner is specified only visit fib6_nodes

We now allow NULL rt6_info walker functions to we only visit nodes.

Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: Martin Lau <kafai@...com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/ipv6/ip6_fib.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 0725fc1..8db8b1c 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1518,6 +1518,12 @@ static int fib6_clean_node(struct fib6_walker_t *w)
 	if (c->sernum != FIB6_NO_SERNUM_CHANGE)
 		c->w.node->fn_sernum = c->sernum;
 
+	if (!c->func) {
+		WARN_ON_ONCE(c->sernum == FIB6_NO_SERNUM_CHANGE);
+		w->leaf = NULL;
+		return 0;
+	}
+
 	for (rt = w->leaf; rt; rt = rt->dst.rt6_next) {
 		res = c->func(rt, c->arg);
 		if (res < 0) {
-- 
1.9.3

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