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SubjectRe: [PATCH 1/1] via-rhine: Fix hanging with high CPU load on low-end broads.
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From: Bjarke Istrup Pedersen <gurligebis@gentoo.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);

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