linux-kernel - Re: stmmac: add a warning when aliases are not present in device tree

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Message-ID: <CAHp75VfGhk6HNAOQEePic=Ma2Hy4pE4cRXBHvFjaMFDrb6R4Mg@mail.gmail.com>
Date:	Tue, 24 Nov 2015 01:35:38 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	peppe.cavallaro@...com, netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Kosina <trivial@...nel.org>
Subject: Re: stmmac: add a warning when aliases are not present in device tree

On Mon, Nov 23, 2015 at 5:46 PM, Pavel Machek <pavel@....cz> wrote:
>
>
> If aliases are not present in device tree, stmmac_platform.c will
> happily assign bus_id of 0 to all the ethernet interfaces, resulting
> in hard to debug problems.
>
> At least warn the user about the problem.
>
> Signed-off-by: Pavel Machek <pavel@...x.de>
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index f9b42f1..ee8aa26 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -161,8 +161,10 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
>                 plat->max_speed = -1;
>
>         plat->bus_id = of_alias_get_id(np, "ethernet");
> -       if (plat->bus_id < 0)
> +       if (plat->bus_id < 0) {
> +               dev_warn(&pdev->dev, "no aliases for ethernet; multiple ethernets will break\n");

Spelling: will break what?

Perhaps "multiple ethernet support will be broken".


>                 plat->bus_id = 0;
> +       }
>
>         /* Default to phy auto-detection */
>         plat->phy_addr = -1;
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
> --
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-- 
With Best Regards,
Andy Shevchenko
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