netdev - Re: bridge/netfilter: regression in 2.6.39.1

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Date:	Mon, 6 Jun 2011 13:07:46 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Alexander Holler <holler@...oftware.de>,
	linux-kernel@...r.kernel.org, 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

On Mon, Jun 06, 2011 at 06:11:45PM +0200, Eric Dumazet wrote:
> Le lundi 06 juin 2011 à 11:32 -0400, Neil Horman a écrit :
> 
> > Not to drag this out further, but since you illustrated the correct way to do
> > this with the blackhole_ops test, and this modification now gives us two
> > instances of that case, would it perhaps be better to just do this in
> > dst_metrics_write_ptr:
> > 
> > return dst->ops->cow_metrics ? return dst->ops->cow_metrics(dst, p) : NULL;
> > 
> > Then we could eliminate the two functions that do nothing be retun NULL (along
> > with their respective call instructions), and save any future users from having
> > to remember to include a dummy cow_metrics method if they happen to set the read
> > only flag on thier dst_ops?
> 
> Well, I prefer how David coded the thing.
> We can add selective traces where we want.
> 
> Having a default behavior might give much more work to find a bug in
> this area. A NULL pointer access gives us an immediate indication.
> 
> Its a bit late to add an "if (dst->ops->cow_metrics)" test now that we
> covered all call sites ;)
> 
> But we probably have more bugs elsewhere, because of many dst changes in
> 2.6.39
Ok, sounds reasonable to me.

Reviewed-by: Neil Horman <nhorman@...driver.com>

> 
> 
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