linux-kernel - Re: [PATCH v2 7/7] backlight: gpio: use a helper variable for &pdev->dev

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Message-ID: <20190722152347.fuar2lezfhp7iuyy@holly.lan>
Date:   Mon, 22 Jul 2019 16:23:47 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 7/7] backlight: gpio: use a helper variable for
 &pdev->dev

On Mon, Jul 22, 2019 at 05:03:02PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Instead of dereferencing pdev each time, use a helper variable for
> the associated device pointer.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>

Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>


> ---
>  drivers/video/backlight/gpio_backlight.c | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
> index cd6a75bca9cc..091ff799659a 100644
> --- a/drivers/video/backlight/gpio_backlight.c
> +++ b/drivers/video/backlight/gpio_backlight.c
> @@ -54,29 +54,32 @@ static const struct backlight_ops gpio_backlight_ops = {
>  
>  static int gpio_backlight_probe(struct platform_device *pdev)
>  {
> -	struct gpio_backlight_platform_data *pdata =
> -		dev_get_platdata(&pdev->dev);
> +	struct gpio_backlight_platform_data *pdata;
>  	struct backlight_properties props;
>  	struct backlight_device *bl;
>  	struct gpio_backlight *gbl;
>  	enum gpiod_flags flags;
> +	struct device *dev;
>  	int ret, def_value;
>  
> -	gbl = devm_kzalloc(&pdev->dev, sizeof(*gbl), GFP_KERNEL);
> +	dev = &pdev->dev;
> +	pdata = dev_get_platdata(dev);
> +
> +	gbl = devm_kzalloc(dev, sizeof(*gbl), GFP_KERNEL);
>  	if (gbl == NULL)
>  		return -ENOMEM;
>  
>  	if (pdata)
>  		gbl->fbdev = pdata->fbdev;
>  
> -	def_value = device_property_read_bool(&pdev->dev, "default-on");
> +	def_value = device_property_read_bool(dev, "default-on");
>  	flags = def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
>  
> -	gbl->gpiod = devm_gpiod_get(&pdev->dev, NULL, flags);
> +	gbl->gpiod = devm_gpiod_get(dev, NULL, flags);
>  	if (IS_ERR(gbl->gpiod)) {
>  		ret = PTR_ERR(gbl->gpiod);
>  		if (ret != -EPROBE_DEFER) {
> -			dev_err(&pdev->dev,
> +			dev_err(dev,
>  				"Error: The gpios parameter is missing or invalid.\n");
>  		}
>  		return ret;
> @@ -85,11 +88,10 @@ static int gpio_backlight_probe(struct platform_device *pdev)
>  	memset(&props, 0, sizeof(props));
>  	props.type = BACKLIGHT_RAW;
>  	props.max_brightness = 1;
> -	bl = devm_backlight_device_register(&pdev->dev, dev_name(&pdev->dev),
> -					&pdev->dev, gbl, &gpio_backlight_ops,
> -					&props);
> +	bl = devm_backlight_device_register(dev, dev_name(dev), dev, gbl,
> +					    &gpio_backlight_ops, &props);
>  	if (IS_ERR(bl)) {
> -		dev_err(&pdev->dev, "failed to register backlight\n");
> +		dev_err(dev, "failed to register backlight\n");
>  		return PTR_ERR(bl);
>  	}
>  
> -- 
> 2.21.0
>