netdev - [PATCH RFC 3/6] ipv6: if no function for cleaner is specified only visit nodes

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Message-Id: <ee139a874fbb76f5116e9a66e764382d5cfaf6d2.1410477596.git.hannes@stressinduktion.org>
Date:	Fri, 12 Sep 2014 01:21:50 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Vlad Yasevich <vyasevich@...il.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH RFC 3/6] ipv6: if no function for cleaner is specified only visit 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>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 net/ipv6/ip6_fib.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 101efab..590c5d2 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1529,6 +1529,13 @@ static int fib6_clean_node(struct fib6_walker_t *w)
 	if (c->sernum)
 		c->w.node->fn_sernum = c->sernum;
 
+	/* if func is NULL only visit node to update sernum */
+	if (!c->func) {
+		WARN_ON_ONCE(!c->sernum);
+		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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