netdev - Re: [PATCH v2 net] atlantic: fix deadlock at aq_nic

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Date:   Fri, 21 Oct 2022 21:01:41 +0200
From:   Íñigo Huguet <ihuguet@...hat.com>
To:     Igor Russkikh <irusskikh@...vell.com>
Cc:     kuba@...nel.org, andrew@...n.ch, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, mstarovo@...me,
        netdev@...r.kernel.org, Li Liang <liali@...hat.com>
Subject: Re: [PATCH v2 net] atlantic: fix deadlock at aq_nic_stop

On Thu, Oct 20, 2022 at 10:56 AM Igor Russkikh <irusskikh@...vell.com> wrote:
>
>
>
> On 10/20/2022 9:53 AM, Íñigo Huguet wrote:
> > NIC is stopped with rtnl_lock held, and during the stop it cancels the
> > 'service_task' work and free irqs.
>
> Hi Íñigo, thanks for taking care of this.
>
> Just reviewed, overall looks reasonable for me. Unfortunately I don't recall
> now why RTNL lock was used originally, most probably we've tried to secure
> parallel "ip macsec configure something" commands execution.
>
> But the model with internal mutex looks safe for me.
>
> Unfortunately I now have no ability to verify your patch, edge usecase here
> would be to try stress running in parallel:
> "ethtool -S <iface>"
> "ip macsec show"
> "ip macsec <change something>"
> Plus ideal would be link flipping.

I've been running all this in parallel for some hours without issue.


>
> Have you tried something like that?
>
> Reviewed-by: Igor Russkikh <irusskikh@...vell.com>
>
> Regards,
>   Igor
>


--
Íñigo Huguet