netdev - Re: [PATCH] ipv4: check rt_genid in dst

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Date:	Fri, 19 Mar 2010 16:56:00 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Timo Teras <timo.teras@....fi>
Cc:	netdev@...r.kernel.org, timo.teras@....fi
Subject: Re: [PATCH] ipv4: check rt_genid in dst_check

Timo Teras <timo.teras@....fi> wrote:
>
> @@ -1726,7 +1726,9 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
> 
> static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
> {
> -       return NULL;
> +       if (dst && rt_is_expired((struct rtable *)dst))
> +               return NULL;

Sorry I didn't spot this the first time around, but the dst check
is redundant too.  Since the only path leading to this code is

static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
{
	if (dst->obsolete)
		dst = dst->ops->check(dst, cookie);
	return dst;
}

I'll send a patch to remove the same check on the IPv6 path.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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