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

[Leon Romanovsky <leon@kernel.org>]

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