netdev - Re: [Patch net-next] net_sched: refactor out tcf

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Date:	Mon, 6 Oct 2014 09:56:01 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next] net_sched: refactor out tcf_exts

On Sun, Oct 5, 2014 at 8:04 PM, John Fastabend <john.fastabend@...il.com> wrote:
> On 10/05/2014 06:47 PM, John Fastabend wrote:
>>
>> On 10/03/2014 03:51 PM, Cong Wang wrote:
>>>
>>> As Jamal pointed it out, tcf_exts is really unnecessary,
>>> we can definitely refactor it out without losing any functionality.
>>> This could also remove an indirect layer which makes the code
>>> much easier to read.
>>>
>>> This patch:
>>>
>>> 1) moves exts->action and exts->police into tp->ops, since they
>>> are statically assigned
>>>
>>> 2) moves exts->actions list head out
>>>
>>> 3) removes exts->type, act->type does the same thing
>>>
>>> 4) renames tcf_exts_*() functions to tcf_act_*()
>>>
>>> Cc: Jamal Hadi Salim <jhs@...atatu.com>
>>> Cc: John Fastabend <john.r.fastabend@...el.com>
>>> Cc: "David S. Miller" <davem@...emloft.net>
>>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>>> ---
>>
>>
>> Looks OK to me and removes a layer of abstraction without changing
>> the code much. This is going to conflict with my series so I'll hold
>> off resubmitting it until this is dealt with. I need to respin that
>> ematch fix up to drop the ingress lock.
>>
>> Acked-by: John Fastabend <john.r.fastabend@...el.com>
>>
>> [...]
>>
>
> But after running my test kit I see a null pointer dereference
> in cls_cgroup in tcf_act_change().
>
> Looks like you dropped an initializer...

Oops, yeah, should have an INIT_LIST_HEAD()...

I will send an update.

Thanks!
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