linux-kernel - Re: [PATCH RESEND 1/7] watchdog: at32ap700x_wdt: use devm

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Date:	Mon, 29 Apr 2013 10:52:03 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, 'Wim Van Sebroeck' <wim@...ana.be>,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH RESEND 1/7] watchdog: at32ap700x_wdt: use devm_*()
 functions

On Mon, Apr 29, 2013 at 06:34:31PM +0900, Jingoo Han wrote:
> Use devm_*() functions to make cleanup paths simpler.
> 
> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> ---
>  drivers/watchdog/at32ap700x_wdt.c |   12 ++++--------
>  1 files changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/watchdog/at32ap700x_wdt.c b/drivers/watchdog/at32ap700x_wdt.c
> index 7a715e3..c4cb552 100644
> --- a/drivers/watchdog/at32ap700x_wdt.c
> +++ b/drivers/watchdog/at32ap700x_wdt.c
> @@ -321,13 +321,14 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
>  		return -ENXIO;
>  	}
>  
> -	wdt = kzalloc(sizeof(struct wdt_at32ap700x), GFP_KERNEL);
> +	wdt = devm_kzalloc(&pdev->dev, sizeof(struct wdt_at32ap700x),
> +			GFP_KERNEL);
>  	if (!wdt) {
>  		dev_dbg(&pdev->dev, "no memory for wdt structure\n");
>  		return -ENOMEM;
>  	}
>  
> -	wdt->regs = ioremap(regs->start, resource_size(regs));
> +	wdt->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
>  	if (!wdt->regs) {
>  		ret = -ENOMEM;
>  		dev_dbg(&pdev->dev, "could not map I/O memory\n");
> @@ -342,7 +343,7 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
>  		dev_info(&pdev->dev, "CPU must be reset with external "
>  				"reset or POR due to silicon errata.\n");
>  		ret = -EIO;
> -		goto err_iounmap;
> +		goto err_free;
>  	} else {
>  		wdt->users = 0;
>  	}
> @@ -375,10 +376,7 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
>  
>  err_register:
>  	platform_set_drvdata(pdev, NULL);
> -err_iounmap:
> -	iounmap(wdt->regs);
>  err_free:
> -	kfree(wdt);
>  	wdt = NULL;
>  	return ret;
>  }
> @@ -391,8 +389,6 @@ static int __exit at32_wdt_remove(struct platform_device *pdev)
>  			at32_wdt_stop();
>  
>  		misc_deregister(&wdt->miscdev);
> -		iounmap(wdt->regs);
> -		kfree(wdt);
>  		wdt = NULL;
>  		platform_set_drvdata(pdev, NULL);
>  	}

err_free isn't really appropriate anymore as label,
and platform_set_drvdata(pdev, NULL) as well as the associated complexity
in at32_wdt_remove is not really needed, but especially the latter should
really be addressed in another patch, so

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