From: jamal <hadi@cyberus.ca>
To: Jarek Poplawski <jarkao2@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
David Miller <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next V3] net: dynamic ingress_queue allocation
Date: Sun, 03 Oct 2010 09:10:34 -0400 [thread overview]
Message-ID: <1286111434.3812.208.camel@bigi> (raw)
In-Reply-To: <20101003094221.GA2028@del.dom.local>
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
next prev parent reply other threads:[~2010-10-03 13:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-28 15:58 [PATCH net-next2.6] net: rename netdev rx_queue to ingress_queue Eric Dumazet
2010-09-28 18:04 ` Jarek Poplawski
2010-09-29 10:56 ` jamal
2010-09-29 13:18 ` Jarek Poplawski
2010-09-29 16:54 ` Jarek Poplawski
2010-09-30 22:58 ` [PATCH net-next2.6] net: dynamic ingress_queue allocation Eric Dumazet
2010-10-01 11:45 ` jamal
2010-10-01 13:56 ` [PATCH net-next V2] " Eric Dumazet
2010-10-02 9:32 ` Jarek Poplawski
2010-10-02 16:11 ` [PATCH net-next V3] " Eric Dumazet
2010-10-03 9:42 ` Jarek Poplawski
2010-10-03 13:10 ` jamal [this message]
2010-10-04 8:42 ` Eric Dumazet
2010-10-04 9:00 ` [PATCH net-next] net: relax rtnl_dereference() Eric Dumazet
2010-10-05 7:29 ` David Miller
2010-10-04 12:06 ` [PATCH net-next V3] net: dynamic ingress_queue allocation Jarek Poplawski
2010-10-04 12:52 ` Eric Dumazet
2010-10-04 14:24 ` Jarek Poplawski
2010-10-04 15:21 ` Eric Dumazet
2010-10-05 7:24 ` David Miller
2010-10-05 7:31 ` Eric Dumazet
2010-10-02 12:10 ` [PATCH net-next V2] " jamal
2010-09-29 20:27 ` [PATCH net-next2.6] net: rename netdev rx_queue to ingress_queue David Miller
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