linux-kernel - Re: [RFC net-next 0/2] Introduce MDIO probe order C45 over C22

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Date:   Wed, 2 Jun 2021 04:19:43 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Wong Vee Khee <vee.khee.wong@...ux.intel.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC net-next 0/2] Introduce MDIO probe order C45 over C22

> Yeah, you're right. Thanks for pointing that out. It should be:
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 1539ea021ac0..73bfde770f2d 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -862,11 +862,22 @@ struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
>         c45_ids.mmds_present = 0;
>         memset(c45_ids.device_ids, 0xff, sizeof(c45_ids.device_ids));
> 
> -       if (is_c45)
> +       if (is_c45) {
>                 r = get_phy_c45_ids(bus, addr, &c45_ids);
> -       else
> +       } else {
>                 r = get_phy_c22_id(bus, addr, &phy_id);
> 
> +               if (phy_id == 0) {
> +                       r = get_phy_c45_ids(bus, addr, &c45_ids);
> +                       if (r == -ENOTSUPP || r == -ENODEV)
> +                               return phy_device_create(bus, addr, phy_id,
> +                                                        false, &c45_ids);
> +                       else
> +                               return phy_device_create(bus, addr, phy_id,
> +                                                        true, &c45_ids);

Still not correct. Think about when get_phy_c22_id() returns an
error. Walk through all the different code paths and check they do the
right thing. It is actually a lot more complex than what is shown
here. Think about all the different types of PHYs and all the
different types of MDIO bus drivers.

      Andrew