netdev - Re: Oops in filter add

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Date:	Tue, 20 Mar 2007 12:02:15 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Chris Madden <chris@...lexsecurity.com>
CC:	hadi@...erus.ca, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org, tgraf@...g.ch
Subject: Re: Oops in filter add

Chris Madden wrote:
> Thanks for all your replies!
> 
> One thing I did notice in examining tc_ctl_tfilter was that there is
> something like:
> 
>         qdisc_lock_tree(dev);
>         tp->next = *back;
>         *back = tp;
>         qdisc_unlock_tree(dev);
> 
> And then proceed to the data structure down below with:
> 
> err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
> 
> Simply reordering these seems to ameliorate the problem greatly.  I
> don't know if this is a generic solution or something specific to the
> basic filter only. 


It might hide the problem, but there are currently a lot of places
where things can go wrong.

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