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Date:	Fri, 19 Mar 2010 17:00:22 +0800
From:	Herbert Xu <>
To:	Timo Teras <>,
	"David S. Miller" <>
Subject: Re: [PATCH] ipv4: check rt_genid in dst_check

On Fri, Mar 19, 2010 at 04:56:00PM +0800, Herbert Xu wrote:
> I'll send a patch to remove the same check on the IPv6 path.

ipv6: Remove redundant dst NULL check in ip6_dst_check

As the only path leading to ip6_dst_check makes an indirect call
through dst->ops, dst cannot be NULL in ip6_dst_check.

This patch removes this check in case it misleads people who
come across this code.

Signed-off-by: Herbert Xu <>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 52cd3ef..7fcb0e5 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -879,7 +879,7 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
 	rt = (struct rt6_info *) dst;
-	if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
+	if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
 		return dst;
 	return NULL;

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