netdev - Re: [PATCH wpan-next 19/20] ieee802154: hwsim: Do not check the rtnl

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Message-ID: <CAK-6q+j+xv+KwyN1M-uNy-G4y9uqQLU9Z8kDRF9bSs3w0VmTBA@mail.gmail.com>
Date:   Mon, 1 Aug 2022 19:58:45 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Network Development <netdev@...r.kernel.org>,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan-next 19/20] ieee802154: hwsim: Do not check the rtnl

Hi,

On Tue, Jul 5, 2022 at 9:23 PM Alexander Aring <aahringo@...hat.com> wrote:
>
> Hi,
>
> On Fri, Jul 1, 2022 at 10:37 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> >
> > There is no need to ensure the rtnl is locked when changing a driver's
> > channel. This cause issues when scanning and this is the only driver
> > relying on it. Just drop this dependency because it does not seem
> > legitimate.
> >
>
> switching channels relies on changing pib attributes, pib attributes
> are protected by rtnl. If you experience issues here then it's
> probably because you do something wrong. All drivers assuming here
> that rtnl lock is held.

especially this change could end in invalid free. Maybe we can solve
this problem in a different way, what exactly is the problem by
helding rtnl lock?

- Alex