linux-kernel - Re: [PATCH 2/3] gpio: xilinx: use helper variable to store the address of pdev->dev

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Message-ID: <fe3669cd-99a5-42d2-99af-acbe28485577@amd.com>
Date: Tue, 1 Oct 2024 12:28:19 +0200
From: Michal Simek <michal.simek@....com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
 Linus Walleij <linus.walleij@...aro.org>,
 Shubhrajyoti Datta <shubhrajyoti.datta@....com>,
 Srinivas Neeli <srinivas.neeli@....com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 2/3] gpio: xilinx: use helper variable to store the
 address of pdev->dev



On 9/30/24 16:48, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> For better readability don't repeatedly dereference pdev->dev but
> instead store the address of the embedded struct device in a local
> variable in probe().
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>   drivers/gpio/gpio-xilinx.c | 34 +++++++++++++++++-----------------
>   1 file changed, 17 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> index afcf432a1573..d99824d42c77 100644
> --- a/drivers/gpio/gpio-xilinx.c
> +++ b/drivers/gpio/gpio-xilinx.c
> @@ -561,9 +561,10 @@ static const struct irq_chip xgpio_irq_chip = {
>    */
>   static int xgpio_probe(struct platform_device *pdev)
>   {
> +	struct device *dev = &pdev->dev;
>   	struct xgpio_instance *chip;
>   	int status = 0;
> -	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *np = dev->of_node;
>   	u32 is_dual = 0;
>   	u32 width[2];
>   	u32 state[2];
> @@ -571,7 +572,7 @@ static int xgpio_probe(struct platform_device *pdev)
>   	struct gpio_irq_chip *girq;
>   	u32 temp;
>   
> -	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
> +	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
>   	if (!chip)
>   		return -ENOMEM;
>   
> @@ -624,7 +625,7 @@ static int xgpio_probe(struct platform_device *pdev)
>   
>   	chip->gc.base = -1;
>   	chip->gc.ngpio = bitmap_weight(chip->hw_map, 64);
> -	chip->gc.parent = &pdev->dev;
> +	chip->gc.parent = dev;
>   	chip->gc.direction_input = xgpio_dir_in;
>   	chip->gc.direction_output = xgpio_dir_out;
>   	chip->gc.get = xgpio_get;
> @@ -633,21 +634,21 @@ static int xgpio_probe(struct platform_device *pdev)
>   	chip->gc.free = xgpio_free;
>   	chip->gc.set_multiple = xgpio_set_multiple;
>   
> -	chip->gc.label = dev_name(&pdev->dev);
> +	chip->gc.label = dev_name(dev);
>   
>   	chip->regs = devm_platform_ioremap_resource(pdev, 0);
>   	if (IS_ERR(chip->regs)) {
> -		dev_err(&pdev->dev, "failed to ioremap memory resource\n");
> +		dev_err(dev, "failed to ioremap memory resource\n");
>   		return PTR_ERR(chip->regs);
>   	}
>   
> -	chip->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);
> +	chip->clk = devm_clk_get_optional_enabled(dev, NULL);
>   	if (IS_ERR(chip->clk))
> -		return dev_err_probe(&pdev->dev, PTR_ERR(chip->clk), "input clock not found.\n");
> +		return dev_err_probe(dev, PTR_ERR(chip->clk), "input clock not found.\n");
>   
> -	pm_runtime_get_noresume(&pdev->dev);
> -	pm_runtime_set_active(&pdev->dev);
> -	pm_runtime_enable(&pdev->dev);
> +	pm_runtime_get_noresume(dev);
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
>   
>   	xgpio_save_regs(chip);
>   
> @@ -667,8 +668,7 @@ static int xgpio_probe(struct platform_device *pdev)
>   	gpio_irq_chip_set_chip(girq, &xgpio_irq_chip);
>   	girq->parent_handler = xgpio_irqhandler;
>   	girq->num_parents = 1;
> -	girq->parents = devm_kcalloc(&pdev->dev, 1,
> -				     sizeof(*girq->parents),
> +	girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
>   				     GFP_KERNEL);
>   	if (!girq->parents) {
>   		status = -ENOMEM;
> @@ -679,18 +679,18 @@ static int xgpio_probe(struct platform_device *pdev)
>   	girq->handler = handle_bad_irq;
>   
>   skip_irq:
> -	status = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip);
> +	status = devm_gpiochip_add_data(dev, &chip->gc, chip);
>   	if (status) {
> -		dev_err(&pdev->dev, "failed to add GPIO chip\n");
> +		dev_err(dev, "failed to add GPIO chip\n");
>   		goto err_pm_put;
>   	}
>   
> -	pm_runtime_put(&pdev->dev);
> +	pm_runtime_put(dev);
>   	return 0;
>   
>   err_pm_put:
> -	pm_runtime_disable(&pdev->dev);
> -	pm_runtime_put_noidle(&pdev->dev);
> +	pm_runtime_disable(dev);
> +	pm_runtime_put_noidle(dev);
>   	return status;
>   }
>   

make sense.

Acked-by: Michal Simek <michal.simek@....com>

Thanks,
Michal