netdev - Re: [PATCH][NET_SCHED] sch_api: fix qdisc_tree_decrease

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Date:	Tue, 15 Apr 2008 15:09:53 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	David Miller <davem@...emloft.net>, enrico@...erclick.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH][NET_SCHED] sch_api: fix qdisc_tree_decrease_qlen() loop

Jarek Poplawski wrote:
> On Tue, Apr 15, 2008 at 02:37:32PM +0200, Patrick McHardy wrote:
>> Jarek Poplawski wrote:
>>> On Mon, Apr 14, 2008 at 03:11:02PM -0700, David Miller wrote:
>>> ...
>>>>> Jarek Poplawski wrote:
>>> ...
>>>>>> After this fix qdisc_lookup() is omitted both for ingress and root
>>>>>> parents, but looking for root is only wasting a little time here...
>>> ...Actually, there is yet a possibility that somebody uses ffff:
>>> handle for a qdisc (not ingress), which could make here a little
>>> difference, so this place could be improved for this case (even
>>> with something like my earlier debugging patch in this thread,
>>> which BTW could be a safety for maybe some other quirks here),
>>> but it seems it would be better to discourage using this handle
>>> for anything but ingress.
>>
>> I don't think we should do that, it would be preferable to
>> compare the entire handle instead of just the major to avoid
>> this.
> 
> Probably you are right... I guess you could handle this?


On second thought I agree with you, the behaviour is inconsistent
and FFFF: shouldn't be used as major, otherwise the major doesn't
uniquely identify a qdisc anymore.


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