linux-kernel - Re: [PATCH 05/11] m68k/atari: Add missing platform check before registering platform devices

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Message-ID: <CAMuHMdXcJCdt+X53zrSUbpvFxL2WzuQH6MWByFvQ5E0UT2LHYg@mail.gmail.com>
Date:	Sun, 25 Mar 2012 10:01:33 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Michael Schmitz <schmitzmic@...glemail.com>
Cc:	linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] m68k/atari: Add missing platform check before
 registering platform devices

Hi Michael,

On Sun, Mar 25, 2012 at 05:46, Michael Schmitz
<schmitzmic@...glemail.com> wrote:
>> On multi-platform kernels, the Atari platform devices should be registered
>> when running on Atari only. Else it may crash later.
>>
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> ---
>>  arch/m68k/atari/config.c |    3 +++
>>  1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/m68k/atari/config.c b/arch/m68k/atari/config.c
>> index af78731..35fb81d 100644
>> --- a/arch/m68k/atari/config.c
>> +++ b/arch/m68k/atari/config.c
>> @@ -693,6 +693,9 @@ static struct platform_device
>> *atari_platform_devices[] __initdata = {
>>  int __init atari_platform_init(void)
>>  {
>> +       if (!MACH_IS_ATARI)
>> +               return -ENODEV;
>> +
>>        return platform_add_devices(atari_platform_devices,
>> ARRAY_SIZE(atari_platform_devices));
>>  }
>>
>
>
> How about this instead - probe for the EtherNAT config register, and
> register devices only if found?

That's even better, but logically, it's an extra change on top, so I'd like
to keep it separate.

> (may apply with a bit of fuzz)
>
> Otherwise, Acked-by: Michael Schmitz <schmitz@...ian.org>.
>
> --- arch/m68k/atari/config.c.org    2012-03-25 16:02:12.000000000 +1300
> +++ arch/m68k/atari/config.c    2012-03-25 13:37:21.000000000 +1300
> @@ -753,7 +753,19 @@
>
> int __init atari_platform_init(void)
> {
> -    return platform_add_devices(atari_platform_devices,
> ARRAY_SIZE(atari_platform_devices));
> +    if (MACH_IS_ATARI) {

I prefer the "if (!MACH_IS_ATARI) return -ENODEV;" at the top, as it
  - means less code to change if more platform devices are added,
  - means less source code to keep on your mental stack when reading the code,
  - decreases indentation for the rest of the function.

> +        u8 ethernat_cr;
> +        unsigned long enatc_phys = 0x80000023;
> +        unsigned char *enatc_virt;
> +       +        enatc_virt = (unsigned char *)ioremap(enatc_phys, 0xf);
> +        if (hwreg_present(enatc_virt)) {
> +            iounmap(enatc_virt);
> +            return platform_add_devices(atari_platform_devices,
> ARRAY_SIZE(atari_platform_devices));
> +        }
> +        iounmap(enatc_virt);
> +    }
> +    return -ENODEV;   }
>
> arch_initcall(atari_platform_init);

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
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