netdev - Re: [Patch net-next 4/5] net_sched: forbid setting default qdisc to inappropriate ones

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Message-ID: <CAM_iQpWscW+F4pnDXwn6uVsyaxVrYmUL6c8YF4wam29Lb4SVvg@mail.gmail.com>
Date:	Thu, 27 Aug 2015 15:47:55 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [Patch net-next 4/5] net_sched: forbid setting default qdisc to
 inappropriate ones

On Thu, Aug 27, 2015 at 3:42 PM, David Miller <davem@...emloft.net> wrote:
>
> Long term it's the wrong fix, trust me.

So we have plan to convert some non-defaultable qdisc to defaultable?
I don't see a reason here.

>
> If you fix it properly, by making every qdisc capable of being ->init()'d
> without explicit parameters, it will be the best behavior overall.

The problem is ->init() is not even called when setting it as default,
since setting a default qdisc doesn't need to create a qdisc. This is
why the flag has to be in ops->flags rather than qdisc->flags.
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