netdev - Re: [PATCH] r8169: Avoid duplicate sysfs entry creation error

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Date:   Wed, 23 Jun 2021 22:43:59 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     nic_swsd@...ltek.com, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sayanta Pattanayak <sayanta.pattanayak@....com>
Subject: Re: [PATCH] r8169: Avoid duplicate sysfs entry creation error

On Wed, 23 Jun 2021 21:48:14 +0200
Heiner Kallweit <hkallweit1@...il.com> wrote:

Hi Heiner,

> On 22.06.2021 14:52, Andre Przywara wrote:
> > From: Sayanta Pattanayak <sayanta.pattanayak@....com>
> > 
> > When registering the MDIO bus for a r8169 device, we use the PCI B/D/F
> > specifier as a (seemingly) unique device identifier.
> > However the very same BDF number can be used on another PCI segment,
> > which makes the driver fail probing:
> > 
> > [ 27.544136] r8169 0002:07:00.0: enabling device (0000 -> 0003)
> > [ 27.559734] sysfs: cannot create duplicate filename '/class/mdio_bus/r8169-700'
> > ....…
> > [ 27.684858] libphy: mii_bus r8169-700 failed to register
> > [ 27.695602] r8169: probe of 0002:07:00.0 failed with error -22
> > 
> > Add the segment number to the device name to make it more unique.
> > 
> > This fixes operation on an ARM N1SDP board, where two boards might be
> > connected together to form an SMP system, and all on-board devices show
> > up twice, just on different PCI segments.
> > 
> > Signed-off-by: Sayanta Pattanayak <sayanta.pattanayak@....com>
> > [Andre: expand commit message]
> > Signed-off-by: Andre Przywara <andre.przywara@....com>
> > ---
> >  drivers/net/ethernet/realtek/r8169_main.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> > index 2c89cde7da1e..209dee295ce2 100644
> > --- a/drivers/net/ethernet/realtek/r8169_main.c
> > +++ b/drivers/net/ethernet/realtek/r8169_main.c
> > @@ -5086,7 +5086,8 @@ static int r8169_mdio_register(struct rtl8169_private *tp)
> >  	new_bus->priv = tp;
> >  	new_bus->parent = &pdev->dev;
> >  	new_bus->irq[0] = PHY_MAC_INTERRUPT;
> > -	snprintf(new_bus->id, MII_BUS_ID_SIZE, "r8169-%x", pci_dev_id(pdev));
> > +	snprintf(new_bus->id, MII_BUS_ID_SIZE, "r8169-%x-%x",
> > +		 pdev->bus->domain_nr, pci_dev_id(pdev));
> >    
> I think you saw the error mail from kernel test robot.
> You have to use pci_domain_nr() instead of member domain_nr directly.

Yeah, thanks, I figured already. I actually missed test-compiling for
x86 :-(

Will send v2 ASAP.

Cheers,
Andre

> 
> >  	new_bus->read = r8169_mdio_read_reg;
> >  	new_bus->write = r8169_mdio_write_reg;
> >   
>