netdev - Re: [PATCH net-next v2 01/10] r8169: add basic phylib support

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Date:   Tue, 10 Jul 2018 21:10:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 01/10] r8169: add basic phylib support

> +static int r8169_mdio_read_reg(struct mii_bus *mii_bus, int phyaddr, int phyreg)
> +{
> +	struct rtl8169_private *tp = mii_bus->priv;
> +
> +	if (phyaddr > 0)
> +		return -EINVAL;

Please use ENODEV.

The mdio bus is scanned for devices in __mdiobus_register(). If
mdiobus_scan() returns -ENODEV, it is not considered an error, and it
will continue scanning other addresses on the bus. Any other error is
a real error, and will abort the scan. That will probably abort the
bus registration.

> +static int r8169_mdio_register(struct rtl8169_private *tp)
> +{
> +	struct pci_dev *pdev = tp->pci_dev;
> +	struct mii_bus *new_bus;
> +	int ret;
> +
> +	new_bus = devm_mdiobus_alloc(&pdev->dev);
> +	if (!new_bus)
> +		return -ENOMEM;
> +
> +	new_bus->name = "r8169";
> +	new_bus->phy_mask = ~1;

Once your handling of addr > 0 is correct, you don't need this.  Let
is scan all addresses, just like a normal MDIO bus. The more we can
keep it normal, the better.

     Andrew