netdev - Re: [Patch net 2/2] net_sched: always call ->destroy when ->init() fails

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Date:	Fri, 24 Oct 2014 17:53:33 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Wang Bo <wang.bo116@....com.cn>,
	John Fastabend <john.r.fastabend@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Terry Lam <vtlam@...gle.com>
Subject: Re: [Patch net 2/2] net_sched: always call ->destroy when ->init() fails

On Fri, Oct 24, 2014 at 5:44 PM, Patrick McHardy <kaber@...sh.net> wrote:
> On Fri, Oct 24, 2014 at 05:38:48PM -0700, Cong Wang wrote:
>> On Fri, Oct 24, 2014 at 5:36 PM, Patrick McHardy <kaber@...sh.net> wrote:
>> >
>> > Again, the correct fix is to make qdisc_create_dflt() not call
>> > qdisc_destroy() but clean up the qdisc manually as done in
>> > qdisc_create().
>>
>> I kindly wish you a good luck with fixing all callers of qdisc_create_dflt().
>> Go ahead. :)
>
> Here you go:
>

...

Did you check all ->init() call ->destroy() on failure? Look at the
sch_pie I have fixed in 1/2.

Also check those xxx_init() calling xxx_change().

Really, we don't have to make all ->init() doing cleanup by itself.
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