netdev - Re: [PATCH] net/sched: reset block pointer in tcf_block

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Message-ID: <CAM_iQpX=XLheuuBk_kAa+jHO-e16hnzavHhzHJ4EYWwpjGFzMg@mail.gmail.com>
Date:   Fri, 11 Aug 2017 13:18:08 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH] net/sched: reset block pointer in tcf_block_put()

On Thu, Aug 10, 2017 at 2:31 AM, Konstantin Khlebnikov
<khlebnikov@...dex-team.ru> wrote:
> In previous API tcf_destroy_chain() could be called several times and
> some schedulers like hfsc and atm use that. In new API tcf_block_put()
> frees block but leaves stale pointer, second call will free it once again.

Which call path do we call tcf_block_put() for multiple times on
the same block? Please be specific, it is not obvious.