netdev - Re: [PATCH net-next v2 05/10] wwan: core: remove all netdevs on ops unregistering

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Message-ID: <CAMZdPi8-26+qzwYFV5AErbTbFZ78ArF_omCOq450+WuV5Rx81g@mail.gmail.com>
Date:   Tue, 22 Jun 2021 15:50:29 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc:     Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 05/10] wwan: core: remove all netdevs on ops unregistering

On Tue, 22 Jun 2021 at 00:51, Sergey Ryazanov <ryazanov.s.a@...il.com> wrote:
>
> We use the ops owner module hold to protect against ops memory
> disappearing. But this approach does not protect us from a driver that
> unregisters ops but forgets to remove netdev(s) that were created using
> this ops. In such case, we are left with netdev(s), which can not be
> removed since ops is gone. Moreover, batch netdevs removing on
> deinitialization is a desireable option for WWAN drivers as it is a
> quite common task.
>
> Implement deletion of all created links on WWAN netdev ops unregistering
> in the same way that RTNL removes all links on RTNL ops unregistering.
> Simply remove all child netdevs of a device whose WWAN netdev ops is
> unregistering. This way we protecting the kernel from buggy drivers and
> make it easier to write a driver deinitialization code.
>
> Signed-off-by: Sergey Ryazanov <ryazanov.s.a@...il.com>

Reviewed-by: Loic Poulain <loic.poulain@...aro.org>