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Date:   Fri, 16 Oct 2020 17:01:26 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ian Kumlien <ian.kumlien@...il.com>, anthony.l.nguyen@...el.com
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        kernel-team@...com, jesse.brandeburg@...el.com,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH net] ixgbe: fix probing of multi-port devices with one
 MDIO

On Sat, 17 Oct 2020 01:50:59 +0200 Ian Kumlien wrote:
> On Sat, Oct 17, 2020 at 1:20 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > Ian reports that after upgrade from v5.8.14 to v5.9 only one
> > of his 4 ixgbe netdevs appear in the system.
> >
> > Quoting the comment on ixgbe_x550em_a_has_mii():
> >  * Returns true if hw points to lowest numbered PCI B:D.F x550_em_a device in
> >  * the SoC.  There are up to 4 MACs sharing a single MDIO bus on the x550em_a,
> >  * but we only want to register one MDIO bus.
> >
> > This matches the symptoms, since the return value from
> > ixgbe_mii_bus_init() is no longer ignored we need to handle
> > the higher ports of x550em without an error.  
> 
> Nice, that fixes it!
> 
> You can add a:
> Tested-by: Ian Kumlien <ian.kumlien@...il.com>

Will do, thanks!

Tony, should I apply directly to net?

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