netdev - Re: [PATCH net] net/sched: fq_pie: initialize timer earlier in fq_pie

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Date:   Fri, 4 Dec 2020 10:35:07 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Mohit Bhasi <mohitbhasi1998@...il.com>,
        Leslie Monis <lesliemonis@...il.com>
Subject: Re: [PATCH net] net/sched: fq_pie: initialize timer earlier in fq_pie_init()

On Thu, Dec 3, 2020 at 10:41 AM Davide Caratti <dcaratti@...hat.com> wrote:
>
> with the following tdc testcase:
>
>  83be: (qdisc, fq_pie) Create FQ-PIE with invalid number of flows
>
> as fq_pie_init() fails, fq_pie_destroy() is called to clean up. Since the
> timer is not yet initialized, it's possible to observe a splat like this:
...
> fix it moving timer_setup() before any failure, like it was done on 'red'
> with former commit 608b4adab178 ("net_sched: initialize timer earlier in
> red_init()").
>
> Fixes: ec97ecf1ebe4 ("net: sched: add Flow Queue PIE packet scheduler")
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>

Reviewed-by: Cong Wang <cong.wang@...edance.com>