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Date:	Fri, 30 Dec 2011 02:18:46 +0100
From:	Bjarke Istrup Pedersen <gurligebis@...too.org>
To:	David Miller <davem@...emloft.net>
Cc:	romieu@...zoreil.com, shemminger@...tta.com,
	bhutchings@...arflare.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, rl@...lgate.ch
Subject: Re: [PATCH 1/1] via-rhine: Fix hanging with high CPU load on low-end broads.

2011/12/30 David Miller <davem@...emloft.net>:
> From: Bjarke Istrup Pedersen <gurligebis@...too.org>
> Date: Fri, 30 Dec 2011 00:37:17 +0100
>
>> Hmm, it seems like this problem isn't related to the driver, but
>> related to the current HEAD of net-next :)
>
> Please try this patch.
>
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index 30de9e7..4a62c47 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -129,11 +129,14 @@ static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const voi
>        return neigh_create(&nd_tbl, daddr, dst->dev);
>  }
>
> -static int rt6_bind_neighbour(struct rt6_info *rt)
> +static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
>  {
> -       struct neighbour *n = ip6_neigh_lookup(&rt->dst, &rt->rt6i_gateway);
> -       if (IS_ERR(n))
> -               return PTR_ERR(n);
> +       struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway);
> +       if (!n) {
> +               n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
> +               if (IS_ERR(n))
> +                       return PTR_ERR(n);
> +       }
>        dst_set_neighbour(&rt->dst, n);
>
>        return 0;
> @@ -746,7 +749,7 @@ static struct rt6_info *rt6_alloc_cow(const struct rt6_info *ort,
>  #endif
>
>        retry:
> -               if (rt6_bind_neighbour(rt)) {
> +               if (rt6_bind_neighbour(rt, rt->dst.dev)) {
>                        struct net *net = dev_net(rt->dst.dev);
>                        int saved_rt_min_interval =
>                                net->ipv6.sysctl.ip6_rt_gc_min_interval;
> @@ -1397,7 +1400,7 @@ int ip6_route_add(struct fib6_config *cfg)
>                rt->rt6i_prefsrc.plen = 0;
>
>        if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
> -               err = rt6_bind_neighbour(rt);
> +               err = rt6_bind_neighbour(rt, dev);
>                if (err)
>                        goto out;
>        }
> @@ -2084,7 +2087,7 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
>                rt->rt6i_flags |= RTF_ANYCAST;
>        else
>                rt->rt6i_flags |= RTF_LOCAL;
> -       err = rt6_bind_neighbour(rt);
> +       err = rt6_bind_neighbour(rt, rt->dst.dev);
>        if (err) {
>                dst_free(&rt->dst);
>                return ERR_PTR(err);

Hey David,

That patch works, now it boots fine :)
I tried the driver on the 3.1.6 kernel to make sure nothing not tested
is causing problems.

/Bjarke

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