netdev - Re: [PATCH net-next] ravb: Fix "failed to switch device to config mode" message during unbind

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Date:   Wed, 14 Dec 2022 10:12:27 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Phil Edworthy <phil.edworthy@...esas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Hangbin Liu <liuhangbin@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Masaru Nagai <masaru.nagai.vx@...esas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH net-next] ravb: Fix "failed to switch device to config
 mode" message during unbind

On Wed, Dec 14, 2022 at 08:07:55AM +0000, Biju Das wrote:
> Hi Leon Romanovsky,
> 
> Thanks for the feedback.
> 
> > Subject: Re: [PATCH net-next] ravb: Fix "failed to switch device to config
> > mode" message during unbind
> > 
> > On Tue, Dec 13, 2022 at 09:59:38AM +0000, Biju Das wrote:
> > > This patch fixes the error "ravb 11c20000.ethernet eth0: failed to
> > > switch device to config mode" during unbind.
> > >
> > > We are doing register access after pm_runtime_put_sync().
> > >
> > > We usually do cleanup in reverse order of init. Currently in remove(),
> > > the "pm_runtime_put_sync" is not in reverse order.
> > >
> > > Probe
> > > 	reset_control_deassert(rstc);
> > > 	pm_runtime_enable(&pdev->dev);
> > > 	pm_runtime_get_sync(&pdev->dev);
> > >
> > > remove
> > > 	pm_runtime_put_sync(&pdev->dev);
> > > 	unregister_netdev(ndev);
> > > 	..
> > > 	ravb_mdio_release(priv);
> > > 	pm_runtime_disable(&pdev->dev);
> > >
> > > Consider the call to unregister_netdev()
> > > unregister_netdev->unregister_netdevice_queue->rollback_registered_man
> > > y that calls the below functions which access the registers after
> > > pm_runtime_put_sync()
> > >  1) ravb_get_stats
> > >  2) ravb_close
> > >
> > > Fixes: a0d2f20650e8 ("Renesas Ethernet AVB PTP clock driver")
> > 
> > I don't know how you came to this fixes line, but the more correct one is
> > c156633f1353 ("Renesas Ethernet AVB driver proper")
> 
> I got the details from [1]. The file name is renamed immediately after c156633f1353.
> 
> So from Stable backporting point I feel [1] is better.

No, you should use correct tag from the beginning, @stable will figure it.

Thanks