linux-kernel - Re: [PATCH v2 4/4] Input: sun4i-ps2 - Fix handling of platform_get

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Date:   Tue, 15 Sep 2020 18:01:40 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/4] Input: sun4i-ps2 - Fix handling of
 platform_get_irq() error

On Fri, Aug 28, 2020 at 04:57:44PM +0200, Krzysztof Kozlowski wrote:
> platform_get_irq() returns -ERRNO on error.  In such case comparison
> to 0 would pass the check.
> 
> Fixes: e443631d20f5 ("Input: serio - add support for Alwinner A10/A20 PS/2 controller")
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> 
> ---
> 
> Changes since v1:
> 1. None
> ---
>  drivers/input/serio/sun4i-ps2.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/serio/sun4i-ps2.c b/drivers/input/serio/sun4i-ps2.c
> index a681a2c04e39..7da1ea8741fc 100644
> --- a/drivers/input/serio/sun4i-ps2.c
> +++ b/drivers/input/serio/sun4i-ps2.c
> @@ -265,9 +265,8 @@ static int sun4i_ps2_probe(struct platform_device *pdev)
>  
>  	/* Get IRQ for the device */
>  	irq = platform_get_irq(pdev, 0);
> -	if (!irq) {
> -		dev_err(dev, "no IRQ found\n");
> -		error = -ENXIO;
> +	if (irq < 0) {

"irq" is unsigned here, so this will not work. I'll change it to use
drvdat->irq which happens to be signed, and drop "irq" variable.

> +		error = irq;
>  		goto err_disable_clk;
>  	}
>  
> -- 
> 2.17.1
> 

Thanks.

-- 
Dmitry