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Date: Mon, 06 Jun 2011 13:48:51 +0200
From: Alexander Holler <holler@...oftware.de>
To: Neil Horman <nhorman@...driver.com>
CC: linux-kernel@...r.kernel.org,
Eric Dumazet <eric.dumazet@...il.com>,
David Miller <davem@...emloft.net>,
Herbert Xu <herbert@...dor.apana.org.au>,
netdev@...r.kernel.org
Subject: Re: bridge/netfilter: regression in 2.6.39.1
Am 06.06.2011 13:15, schrieb Neil Horman:
> On Fri, Jun 03, 2011 at 09:21:06PM +0200, Alexander Holler wrote:
>> Hello,
>>
>> I'm getting a oops in the bridge code in br_change_mtu() with
>> 2.6.39.1. The patch below seems to fix that.
>>
>> I'm not sure about the usage of dst_cow_metrics_generic() in
>> fake_dst_ops, but after having a quick look at it seems to be ok to
>> use that here.
>>
>> Regards,
>>
>> Alexander
>>
> How did the flags of the dst entry on which we're callnig dst_entry_write_ptr
> wind up getting the READ_ONLY flag set on it? I don't see how we'er falling
> into that clause in which we call cow_metrics when we call dst_metric_set. It
> seems like that flag is set erroneously. perhaps we should just update
> fake_rtable.dst to have the correct flags?
> Neil
It is set by that change:
--------
@@ -124,7 +128,7 @@ void br_netfilter_rtable_init(struct net_bridge *br)
atomic_set(&rt->dst.__refcnt, 1);
rt->dst.dev = br->dev;
rt->dst.path = &rt->dst;
- dst_metric_set(&rt->dst, RTAX_MTU, 1500);
+ dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
rt->dst.flags = DST_NOXFRM;
rt->dst.ops = &fake_dst_ops;
}
--------
The true in dst_init_metrics() is responsible for that flag.
Regards,
Alexander
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