# Re: \[PATCH 4/4\] drivers/video/backlight/adp5520\_bl.c: use devm\_ functions

- From: Michael Hennerich \<michael.hennerich@analog.com\>
- Date: 2012-01-23 08:33:25 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2012/01/3812212
- Thread: https://ratatoskr.run/kernel-janitors/2012/01/3811786/t.md

```text
On 01/20/2012 10:25 PM, Julia Lawall wrote:
> From: Julia Lawall<redacted>
>
> The various devm_ functions allocate memory that is released when a driver
> detaches.  This patch uses these functions for data that is allocated in
> the probe function of a platform device and is only freed in the remove
> function.
>
> Signed-off-by: Julia Lawall<redacted>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
> ---
>   drivers/video/backlight/adp5520_bl.c |    6 +-----
>   1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
> index 2e630bf..4911ea7 100644
> --- a/drivers/video/backlight/adp5520_bl.c
> +++ b/drivers/video/backlight/adp5520_bl.c
> @@ -289,7 +289,7 @@ static int __devinit adp5520_bl_probe(struct platform_device *pdev)
>   	struct adp5520_bl *data;
>   	int ret = 0;
>
> -	data = kzalloc(sizeof(*data), GFP_KERNEL);
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
>   	if (data = NULL)
>   		return -ENOMEM;
>
> @@ -298,7 +298,6 @@ static int __devinit adp5520_bl_probe(struct platform_device *pdev)
>
>   	if (data->pdata  = NULL) {
>   		dev_err(&pdev->dev, "missing platform data\n");
> -		kfree(data);
>   		return -ENODEV;
>   	}
>
> @@ -314,7 +313,6 @@ static int __devinit adp5520_bl_probe(struct platform_device *pdev)
>   				&adp5520_bl_ops,&props);
>   	if (IS_ERR(bl)) {
>   		dev_err(&pdev->dev, "failed to register backlight\n");
> -		kfree(data);
>   		return PTR_ERR(bl);
>   	}
>
> @@ -326,7 +324,6 @@ static int __devinit adp5520_bl_probe(struct platform_device *pdev)
>   	if (ret) {
>   		dev_err(&pdev->dev, "failed to register sysfs\n");
>   		backlight_device_unregister(bl);
> -		kfree(data);
>   	}
>
>   	platform_set_drvdata(pdev, bl);
> @@ -348,7 +345,6 @@ static int __devexit adp5520_bl_remove(struct platform_device *pdev)
>   				&adp5520_bl_attr_group);
>
>   	backlight_device_unregister(bl);
> -	kfree(data);
>
>   	return 0;
>   }
>
>


-- 
Greetings,
Michael

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```