linux-kernel - Re: [PATCH 03/10] Input: twl4030_keypad: Fix platform_get

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Message-ID: <20171117202702.nzfptx5qdcujh4al@dtor-ws>
Date:   Fri, 17 Nov 2017 12:27:02 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>
Cc:     maxime.ripard@...e-electrons.com, wens@...e.org,
        linux@...ck-us.net, wsa@...-dreams.de, daniel.thompson@...aro.org,
        mcuos.com@...il.com, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/10] Input: twl4030_keypad: Fix platform_get_irq's
 error checking

On Sat, Nov 18, 2017 at 12:45:25AM +0530, Arvind Yadav 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>
> ---
>  drivers/input/keyboard/twl4030_keypad.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/keyboard/twl4030_keypad.c b/drivers/input/keyboard/twl4030_keypad.c
> index f9f98ef..f94090e 100644
> --- a/drivers/input/keyboard/twl4030_keypad.c
> +++ b/drivers/input/keyboard/twl4030_keypad.c
> @@ -389,7 +389,7 @@ static int twl4030_kp_probe(struct platform_device *pdev)
>  	}
>  
>  	kp->irq = platform_get_irq(pdev, 0);
> -	if (!kp->irq) {
> +	if (kp->irq < 0) {

kp->irq is unsigned

>  		dev_err(&pdev->dev, "no keyboard irq assigned\n");
>  		return -EINVAL;

Let's not clobber error.

>  	}
> -- 
> 2.7.4
> 

-- 
Dmitry