netdev - Re: [PATCH net-next V3] net: dynamic ingress

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Date:	Sun, 03 Oct 2010 09:10:34 -0400
From:	jamal <hadi@...erus.ca>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next V3] net: dynamic ingress_queue allocation

On Sun, 2010-10-03 at 11:42 +0200, Jarek Poplawski wrote:

> > 
> > To avoid a NULL dereference some lines later.
> > Do I have a guarantee its not NULL here ?
> 
> Do you have any scenario for NULL here? ;-)

This is why i called this part clever earlier ;-> It is 
clever. There are several scenarios (i attempted to represent them
in the tests that Eric run):

1) ingress qdisc has been compiled in
flags & TCQ_F_INGRESS is true
a) user trying to add ingress qdisc first time
then q is null, new is not null and this would work
b) user trying to delete already added qdisc
then q is not null, new is null 

2) ingress qdisc not compiled in
Repeat #1a above, and Eric's check will bail out ..

The one thing that may have been useful is to also try
a "replace" after #1a and maybe after #2

cheers,
jamal

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