linux-kernel - Re: [PATCH 2/4] pwm: Convert pwm-pxa to use devm

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Date:	Sat, 30 Jun 2012 21:38:18 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel@...r.kernel.org, Eric Miao <eric.y.miao@...il.com>
Subject: Re: [PATCH 2/4] pwm: Convert pwm-pxa to use devm_* APIs

On Fri, Jun 29, 2012 at 09:31:22PM +0800, Axel Lin wrote:
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/pwm/pwm-pxa.c |   49 ++++++++++---------------------------------------
>  1 file changed, 10 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
> index d5c6ce5..1cf0597 100644
> --- a/drivers/pwm/pwm-pxa.c
> +++ b/drivers/pwm/pwm-pxa.c
> @@ -1,5 +1,5 @@
>  /*
> - * linux/arch/arm/mach-pxa/pwm.c
> + * drivers/pwm/pwm-pxa.c
>   *
>   * simple driver for PWM (Pulse Width Modulator) controller
>   *
> @@ -145,17 +145,16 @@ static int __devinit pwm_probe(struct platform_device *pdev)
>  	struct resource *r;
>  	int ret = 0;
>  
> -	pwm = kzalloc(sizeof(*pwm), GFP_KERNEL);
> +	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
>  	if (pwm == NULL) {
>  		dev_err(&pdev->dev, "failed to allocate memory\n");
>  		return -ENOMEM;
>  	}
>  
> -	pwm->clk = clk_get(&pdev->dev, NULL);
> -	if (IS_ERR(pwm->clk)) {
> -		ret = PTR_ERR(pwm->clk);
> -		goto err_free;
> -	}
> +	pwm->clk = devm_clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(pwm->clk))
> +		return PTR_ERR(pwm->clk);
> +
>  	pwm->clk_enabled = 0;
>  
>  	pwm->chip.dev = &pdev->dev;
> @@ -166,23 +165,12 @@ static int __devinit pwm_probe(struct platform_device *pdev)
>  	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (r == NULL) {
>  		dev_err(&pdev->dev, "no memory resource defined\n");
> -		ret = -ENODEV;
> -		goto err_free_clk;
> -	}
> -
> -	r = request_mem_region(r->start, resource_size(r), pdev->name);
> -	if (r == NULL) {
> -		dev_err(&pdev->dev, "failed to request memory resource\n");
> -		ret = -EBUSY;
> -		goto err_free_clk;
> +		return -ENODEV;
>  	}
>  
> -	pwm->mmio_base = ioremap(r->start, resource_size(r));
> -	if (pwm->mmio_base == NULL) {
> -		dev_err(&pdev->dev, "failed to ioremap() registers\n");
> -		ret = -ENODEV;
> -		goto err_free_mem;
> -	}
> +	pwm->mmio_base = devm_request_and_ioremap(&pdev->dev, r);
> +	if (pwm->mmio_base == NULL)
> +		return -ENODEV;

Same comment as for the first patch.

>  	ret = pwmchip_add(&pwm->chip);
>  	if (ret < 0) {
> @@ -192,34 +180,17 @@ static int __devinit pwm_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, pwm);
>  	return 0;
> -
> -err_free_mem:
> -	release_mem_region(r->start, resource_size(r));
> -err_free_clk:
> -	clk_put(pwm->clk);
> -err_free:
> -	kfree(pwm);
> -	return ret;
>  }
>  
>  static int __devexit pwm_remove(struct platform_device *pdev)
>  {
>  	struct pxa_pwm_chip *chip;
> -	struct resource *r;
>  
>  	chip = platform_get_drvdata(pdev);
>  	if (chip == NULL)
>  		return -ENODEV;
>  
>  	pwmchip_remove(&chip->chip);
> -
> -	iounmap(chip->mmio_base);
> -
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	release_mem_region(r->start, resource_size(r));
> -
> -	clk_put(chip->clk);
> -	kfree(chip);
>  	return 0;

This should probably also be "return pwmchip_remove(...);". But that's
an unrelated change so I'll do that in a separate commit.

Thierry

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