linux-kernel - Re: [PATCH net, v2] of_mdio: avoid MDIO bus removal when a PHY is missing

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Message-ID: <CAMuHMdVrqeCJ98TagxSU391AFAYRsLC-y+8v0rpBH=jecV44Mg@mail.gmail.com>
Date:   Tue, 9 Jan 2018 09:35:56 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Madalin-cristian Bucur <madalin.bucur@....com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        netdev <netdev@...r.kernel.org>, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net, v2] of_mdio: avoid MDIO bus removal when a PHY is missing

Hi Madalin,

On Tue, Jan 9, 2018 at 9:33 AM, Madalin Bucur <madalin.bucur@....com> wrote:
> If one of the child devices is missing the of_mdiobus_register_phy()
> call will return -ENODEV. When a missing device is encountered the
> registration of the remaining PHYs is stopped and the MDIO bus will
> fail to register. Propagate all errors except ENODEV to avoid it.
>
> Signed-off-by: Madalin Bucur <madalin.bucur@....com>

Thanks for your patch!

> ---
> v2: add an error print for the first change; the second place has
>     some noise aleady generated by the exing code
>
>  drivers/of/of_mdio.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index 3481e69..a249370 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -231,8 +231,14 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
>                         rc = of_mdiobus_register_phy(mdio, child, addr);
>                 else
>                         rc = of_mdiobus_register_device(mdio, child, addr);
> -               if (rc)
> -                       goto unregister;
> +
> +               if (rc == -ENODEV)
> +                       dev_err(&mdio->dev,
> +                               "MDIO device at address %d is missing.\n",
> +                               addr);
> +               else
> +                       if (rc)

You can merge the two lines above into a single line.

> +                               goto unregister;

... dropping the need to reindent the above line.

>         }

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds