linux-kernel - Re: [PATCH -next] m68k/amiga: missing platform_device_unregister() on error in amiga_init

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Date:   Sat, 19 Sep 2020 09:30:51 +0800
From:   miaoqinglang <miaoqinglang@...wei.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] m68k/amiga: missing platform_device_unregister() on
 error in amiga_init_devices()



在 2020/8/26 17:07, Geert Uytterhoeven 写道:
> Hi Qinglang,
> 
> On Tue, Jul 28, 2020 at 4:24 AM Qinglang Miao <miaoqinglang@...wei.com> wrote:
>> Add the missing platform_device_unregister() before return
>> from amiga_init_devices() in the error handling case.
>>
>> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
> 
> Thanks for your patch!
> 
>> --- a/arch/m68k/amiga/platform.c
>> +++ b/arch/m68k/amiga/platform.c
>> @@ -188,8 +188,10 @@ static int __init amiga_init_devices(void)
>>                          return PTR_ERR(pdev);
>>                  error = platform_device_add_data(pdev, &a1200_ide_pdata,
>>                                                   sizeof(a1200_ide_pdata));
> 
> The only reason why platform_device_add_data() can fail is because the
> system ran out of memory.  If that's the case this early, the whole
> system will fail to work anyway, and it doesn't matter that the IDE
> driver will crash later due to missing platform data.
> 
> So I don't think it helps to increase kernel size by adding more error
> handling.
> 
Hi Geert,

Glad to know your opnions, it sounds resonable to me.

Thanks.

>> -               if (error)
>> +               if (error) {
>> +                       platform_device_unregister(pdev);
>>                          return error;
>> +               }
>>          }
>>
>>          if (AMIGAHW_PRESENT(A4000_IDE)) {
>> @@ -199,8 +201,10 @@ static int __init amiga_init_devices(void)
>>                          return PTR_ERR(pdev);
>>                  error = platform_device_add_data(pdev, &a4000_ide_pdata,
>>                                                   sizeof(a4000_ide_pdata));
>> -               if (error)
>> +               if (error) {
>> +                       platform_device_unregister(pdev);
> 
> Likewise.
> 
>>                          return error;
>> +               }
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
>