linux-kernel - Re: [PATCH] Input: 88pm860x-ts: Introduce the use of the managed version of kzalloc

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Date:	Thu, 29 May 2014 00:25:45 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Himangi Saraogi <himangi774@...il.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	julia.lawall@...6.fr
Subject: Re: [PATCH] Input: 88pm860x-ts: Introduce the use of the managed
 version of kzalloc

On Thu, May 29, 2014 at 01:36:03AM +0530, Himangi Saraogi wrote:
> This patch moves most data allocated in the probe function from
> unmanaged interfaces to managed interfaces. The kfrees and error
> handling code is done away with. Also, the unnecesary labels are
> removed and the function pm860x_touch_remove is removed as it becomes
> empty after removing the no longer required function calls. 
> 
> This changes the order of the freeing operations in the remove
> function, putting the free_irq first, and that this may resolve a 
> potential race condition.
> 
> The following Coccinelle semantic patch was used for making a part of
> the change:
> 
> @platform@
> identifier p, probefn, removefn;
> @@
> struct platform_driver p = {
>   .probe = probefn,
>   .remove = removefn,
> };
> 
> @prb@
> identifier platform.probefn, pdev;
> expression e, e1, e2;
> @@
> probefn(struct platform_device *pdev, ...) {
>   <+...
> - e = kzalloc(e1, e2)
> + e = devm_kzalloc(&pdev->dev, e1, e2)
>   ...
> ?-kfree(e);
>   ...+>
> }
> 
> @rem depends on prb@
> identifier platform.removefn;
> expression e;
> @@
> removefn(...) {
>   <...
> - kfree(e);
>   ...>
> }
> 
> Signed-off-by: Himangi Saraogi <himangi774@...il.com>
> Acked-by: Julia Lawall <julia.lawall@...6.fr>


Applied, thank you.

> ---
>  drivers/input/touchscreen/88pm860x-ts.c | 36 +++++++++------------------------
>  1 file changed, 10 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/88pm860x-ts.c b/drivers/input/touchscreen/88pm860x-ts.c
> index 544e20c..30c8cc1 100644
> --- a/drivers/input/touchscreen/88pm860x-ts.c
> +++ b/drivers/input/touchscreen/88pm860x-ts.c
> @@ -16,6 +16,7 @@
>  #include <linux/input.h>
>  #include <linux/mfd/88pm860x.h>
>  #include <linux/slab.h>
> +#include <linux/device.h>
>  
>  #define MEAS_LEN		(8)
>  #define ACCURATE_BIT		(12)
> @@ -234,16 +235,16 @@ static int pm860x_touch_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
> +	touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch),
> +			     GFP_KERNEL);
>  	if (touch == NULL)
>  		return -ENOMEM;
>  	platform_set_drvdata(pdev, touch);
>  
> -	touch->idev = input_allocate_device();
> +	touch->idev = devm_input_allocate_device(&pdev->dev);
>  	if (touch->idev == NULL) {
>  		dev_err(&pdev->dev, "Failed to allocate input device!\n");
> -		ret = -ENOMEM;
> -		goto out;
> +		return -ENOMEM;
>  	}
>  
>  	touch->idev->name = "88pm860x-touch";
> @@ -258,10 +259,11 @@ static int pm860x_touch_probe(struct platform_device *pdev)
>  	touch->res_x = res_x;
>  	input_set_drvdata(touch->idev, touch);
>  
> -	ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler,
> -				   IRQF_ONESHOT, "touch", touch);
> +	ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL,
> +					pm860x_touch_handler, IRQF_ONESHOT,
> +					"touch", touch);
>  	if (ret < 0)
> -		goto out_irq;
> +		return ret;
>  
>  	__set_bit(EV_ABS, touch->idev->evbit);
>  	__set_bit(ABS_X, touch->idev->absbit);
> @@ -279,28 +281,11 @@ static int pm860x_touch_probe(struct platform_device *pdev)
>  	ret = input_register_device(touch->idev);
>  	if (ret < 0) {
>  		dev_err(chip->dev, "Failed to register touch!\n");
> -		goto out_rg;
> +		return ret;
>  	}
>  
>  	platform_set_drvdata(pdev, touch);
>  	return 0;
> -out_rg:
> -	free_irq(touch->irq, touch);
> -out_irq:
> -	input_free_device(touch->idev);
> -out:
> -	kfree(touch);
> -	return ret;
> -}
> -
> -static int pm860x_touch_remove(struct platform_device *pdev)
> -{
> -	struct pm860x_touch *touch = platform_get_drvdata(pdev);
> -
> -	input_unregister_device(touch->idev);
> -	free_irq(touch->irq, touch);
> -	kfree(touch);
> -	return 0;
>  }
>  
>  static struct platform_driver pm860x_touch_driver = {
> @@ -309,7 +294,6 @@ static struct platform_driver pm860x_touch_driver = {
>  		.owner	= THIS_MODULE,
>  	},
>  	.probe	= pm860x_touch_probe,
> -	.remove	= pm860x_touch_remove,
>  };
>  module_platform_driver(pm860x_touch_driver);
>  
> -- 
> 1.9.1
> 

-- 
Dmitry
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