linux-kernel - Re: [PATCH 3/3] watchdog: imx2_wdt: Use 'dev' instead of dereferencing it repeatedly

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Date:   Mon, 30 Sep 2019 06:18:18 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Anson Huang <Anson.Huang@....com>
Cc:     wim@...ux-watchdog.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Linux-imx@....com
Subject: Re: [PATCH 3/3] watchdog: imx2_wdt: Use 'dev' instead of
 dereferencing it repeatedly

On Tue, Sep 24, 2019 at 03:07:08PM +0800, Anson Huang wrote:
> Add helper variable dev = &pdev->dev to simply the code.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/imx2_wdt.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
> index 034f32c..f8d58bf 100644
> --- a/drivers/watchdog/imx2_wdt.c
> +++ b/drivers/watchdog/imx2_wdt.c
> @@ -246,13 +246,14 @@ static const struct regmap_config imx2_wdt_regmap_config = {
>  
>  static int __init imx2_wdt_probe(struct platform_device *pdev)
>  {
> +	struct device *dev = &pdev->dev;
>  	struct imx2_wdt_device *wdev;
>  	struct watchdog_device *wdog;
>  	void __iomem *base;
>  	int ret;
>  	u32 val;
>  
> -	wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
> +	wdev = devm_kzalloc(dev, sizeof(*wdev), GFP_KERNEL);
>  	if (!wdev)
>  		return -ENOMEM;
>  
> @@ -260,16 +261,16 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
>  	if (IS_ERR(base))
>  		return PTR_ERR(base);
>  
> -	wdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
> +	wdev->regmap = devm_regmap_init_mmio_clk(dev, NULL, base,
>  						 &imx2_wdt_regmap_config);
>  	if (IS_ERR(wdev->regmap)) {
> -		dev_err(&pdev->dev, "regmap init failed\n");
> +		dev_err(dev, "regmap init failed\n");
>  		return PTR_ERR(wdev->regmap);
>  	}
>  
> -	wdev->clk = devm_clk_get(&pdev->dev, NULL);
> +	wdev->clk = devm_clk_get(dev, NULL);
>  	if (IS_ERR(wdev->clk)) {
> -		dev_err(&pdev->dev, "can't get Watchdog clock\n");
> +		dev_err(dev, "can't get Watchdog clock\n");
>  		return PTR_ERR(wdev->clk);
>  	}
>  
> @@ -279,12 +280,12 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
>  	wdog->min_timeout	= 1;
>  	wdog->timeout		= IMX2_WDT_DEFAULT_TIME;
>  	wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000;
> -	wdog->parent		= &pdev->dev;
> +	wdog->parent		= dev;
>  
>  	ret = platform_get_irq(pdev, 0);
>  	if (ret > 0)
> -		if (!devm_request_irq(&pdev->dev, ret, imx2_wdt_isr, 0,
> -				      dev_name(&pdev->dev), wdog))
> +		if (!devm_request_irq(dev, ret, imx2_wdt_isr, 0,
> +				      dev_name(dev), wdog))
>  			wdog->info = &imx2_wdt_pretimeout_info;
>  
>  	ret = clk_prepare_enable(wdev->clk);
> @@ -294,13 +295,13 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
>  	regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val);
>  	wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
>  
> -	wdev->ext_reset = of_property_read_bool(pdev->dev.of_node,
> +	wdev->ext_reset = of_property_read_bool(dev->of_node,
>  						"fsl,ext-reset-output");
>  	platform_set_drvdata(pdev, wdog);
>  	watchdog_set_drvdata(wdog, wdev);
>  	watchdog_set_nowayout(wdog, nowayout);
>  	watchdog_set_restart_priority(wdog, 128);
> -	watchdog_init_timeout(wdog, timeout, &pdev->dev);
> +	watchdog_init_timeout(wdog, timeout, dev);
>  
>  	if (imx2_wdt_is_running(wdev)) {
>  		imx2_wdt_set_timeout(wdog, wdog->timeout);
> @@ -318,7 +319,7 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto disable_clk;
>  
> -	dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n",
> +	dev_info(dev, "timeout %d sec (nowayout=%d)\n",
>  		 wdog->timeout, nowayout);
>  
>  	return 0;
> -- 
> 2.7.4
>