linux-kernel - Re: [PATCH] gpio: ftgpio010: Fix platform_get

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Date:   Sat, 2 Dec 2017 22:19:25 +0530
From:   arvindY <arvind.yadav.cs@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH] gpio: ftgpio010: Fix platform_get_irq's error checking

Hi Linus,

On Saturday 02 December 2017 09:00 PM, Linus Walleij wrote:
> Hi Arvind,
>
> thanks for the patch!
>
> On Thu, Nov 30, 2017 at 3:12 PM, Arvind Yadav <arvind.yadav.cs@...il.com> wrote:
>
>> The platform_get_irq() function returns negative if an error occurs.
>> zero or positive number on success. platform_get_irq() error checking
>> for zero is not correct.
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> (...)
>>          irq = platform_get_irq(pdev, 0);
>> -       if (!irq)
>> -               return -EINVAL;
>> +       if (irq < 0)
>> +               return irq;
> This is wrong.
> For an in-depth explanation why irq 0 in not valid, see:
> https://lwn.net/Articles/470820/
Thank you for sharing this Articles. It's really helpful.
>
> It should be:
>
> if (irq <= 0)
>    return irq ? irq : -EINVAL;
>
> Please update and resubmit. If you have more patches like this,
> correct them too.
I will resubmit patch.
> Yours,
> Linus Walleij
Thanks,
arvind