linux-kernel - Re: [PATCH 1/7] backlight: gpio: Simplify with dev_err

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Date: Mon, 4 Mar 2024 10:40:00 +0000
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Lee Jones <lee@...nel.org>, Jingoo Han <jingoohan1@...il.com>,
	Helge Deller <deller@....de>, dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] backlight: gpio: Simplify with dev_err_probe()

On Mon, Mar 04, 2024 at 11:11:38AM +0100, Krzysztof Kozlowski wrote:
> Common pattern of handling deferred probe can be simplified with
> dev_err_probe().  Less code and also it prints the error value.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  drivers/video/backlight/gpio_backlight.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index d28c30b2a35d..9f960f853b6e 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -64,13 +64,9 @@ static int gpio_backlight_probe(struct platform_device *pdev)
>  	def_value = device_property_read_bool(dev, "default-on");
>
>  	gbl->gpiod = devm_gpiod_get(dev, NULL, GPIOD_ASIS);
> -	if (IS_ERR(gbl->gpiod)) {
> -		ret = PTR_ERR(gbl->gpiod);
> -		if (ret != -EPROBE_DEFER)
> -			dev_err(dev,
> -				"Error: The gpios parameter is missing or invalid.\n");
> -		return ret;
> -	}
> +	if (IS_ERR(gbl->gpiod))
> +		return dev_err_probe(dev, PTR_ERR(gbl->gpiod),
> +				     "Error: The gpios parameter is missing or invalid.\n");

The "Error: " should be removed from the string. dev_err_probe() already prints
that.


Daniel.