netdev - Re: [PATCH net-next] net: sched: change tcf_del_walker() to use concurrent-safe delete

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Date:   Mon, 3 Sep 2018 11:50:48 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next] net: sched: change tcf_del_walker() to use
 concurrent-safe delete

On Mon, Sep 3, 2018 at 12:06 AM Vlad Buslov <vladbu@...lanox.com> wrote:
>
> Action API was changed to work with actions and action_idr in concurrency
> safe manner, however tcf_del_walker() still uses actions without taking
> reference to them first and deletes them directly, disregarding possible
> concurrent delete.
>
> Change tcf_del_walker() to use tcf_idr_delete_index() that doesn't require
> caller to hold reference to action and accepts action id as argument,
> instead of direct action pointer.

Hmm, why doesn't tcf_del_walker() just take idrinfo->lock? At least
tcf_dump_walker() already does.