linux-kernel - Re: [PATCH v1 4/4] Input: soc_button_array

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Date:   Thu, 23 Feb 2017 00:40:32 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-input@...r.kernel.org,
        Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/4] Input: soc_button_array - Propagate error from
 gpiod_count()

On Mon, Feb 20, 2017 at 06:15:49PM +0200, Andy Shevchenko wrote:
> Since gpiod_count() does not return 0 anymore, we don't need to shadow
> its error code and would safely propagate to the user.
> 
> While here, replace second parameter by NULL in order to prevent side
> effects on _DSD enabled firmware.
> 
> Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

> ---
>  drivers/input/misc/soc_button_array.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
> index ddb2f22fca7a..c3b8e1fb4699 100644
> --- a/drivers/input/misc/soc_button_array.c
> +++ b/drivers/input/misc/soc_button_array.c
> @@ -169,9 +169,10 @@ static int soc_button_probe(struct platform_device *pdev)
>  
>  	button_info = (struct soc_button_info *)id->driver_data;
>  
> -	if (gpiod_count(dev, KBUILD_MODNAME) <= 0) {
> +	error = gpiod_count(dev, NULL);
> +	if (error < 0) {
>  		dev_dbg(dev, "no GPIO attached, ignoring...\n");
> -		return -ENODEV;
> +		return error;
>  	}
>  
>  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> -- 
> 2.11.0
> 

-- 
Dmitry