linux-kernel - Re: [PATCHv3 1/9] extcon: Add extcon_dev_allocate/free() to control the memory of extcon device

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Date:	Thu, 24 Apr 2014 09:42:57 -0500
From:	Felipe Balbi <balbi@...com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
CC:	<linux-kernel@...r.kernel.org>, <myungjoo.ham@...sung.com>,
	<balbi@...com>, <gg@...mlogic.co.uk>, <kishon@...com>,
	<ckeepax@...nsource.wolfsonmicro.com>, <broonie@...nel.org>,
	<k.kozlowski@...sung.com>, <kyungmin.park@...sung.com>
Subject: Re: [PATCHv3 1/9] extcon: Add extcon_dev_allocate/free() to control
 the memory of extcon device

On Thu, Apr 24, 2014 at 09:34:49PM +0900, Chanwoo Choi wrote:
> This patch add APIs to control the extcon device on extcon provider driver.
> The extcon_dev_allocate() allocates the memory of extcon device and initializes
> supported cables. And then extcon_dev_free() decrement the reference of the
> device of extcon device and free the memory of the extcon device. This APIs
> must need to implement devm_extcon_dev_allocate()/free() APIs.
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  drivers/extcon/extcon-class.c | 39 +++++++++++++++++++++++++++++++++++++++
>  include/linux/extcon.h        | 13 +++++++++++++
>  2 files changed, 52 insertions(+)
> 
> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
> index f6df689..bec66d4 100644
> --- a/drivers/extcon/extcon-class.c
> +++ b/drivers/extcon/extcon-class.c
> @@ -565,6 +565,45 @@ static void dummy_sysfs_dev_release(struct device *dev)
>  {
>  }
>  
> +/*
> + * extcon_dev_allocate() - Allocate the memory of extcon device.
> + * @supported_cable:	Array of supported cable names ending with NULL.
> + *			If supported_cable is NULL, cable name related APIs
> + *			are disabled.
> + *
> + * This function allocates the memory for extcon device without allocating
> + * memory in each extcon provider driver and initialize default setting for
> + * extcon device.
> + *
> + * Return the pointer of extcon device if success or ERR_PTR(err) if fail
> + */
> +struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
> +{
> +	struct extcon_dev *edev;
> +
> +	edev = kzalloc(sizeof(*edev), GFP_KERNEL);
> +	if (!edev) {
> +		pr_err("Failed to allocate the memory for extcon device\n");
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	edev->max_supported = 0;
> +	edev->supported_cable = supported_cable;
> +
> +	return edev;
> +}
> +
> +/*
> + * extcon_dev_free() - Free the memory of extcon device.
> + * @edev:	the extcon device to free
> + */
> +void extcon_dev_free(struct extcon_dev *edev)
> +{
> +	if (edev)
> +		kfree(edev);

kfree(NULL) is safe

-- 
balbi

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