Hi,
On Thu, Apr 24, 2014 at 11:44 PM, Felipe Balbi <ba...@ti.com> wrote:
> On Thu, Apr 24, 2014 at 09:34:50PM +0900, Chanwoo Choi wrote:
>> This patch add device managed devm_extcon_dev_{allocate,free} to
>> automatically
>> free the memory of extcon_dev structure without handling free operation.
>>
>> Signed-off-by: Chanwoo Choi <cw00.c...@samsung.com>
>> ---
>> drivers/extcon/extcon-class.c | 70
>> +++++++++++++++++++++++++++++++++++--------
>> include/linux/extcon.h | 11 +++++++
>> 2 files changed, 69 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
>> index bec66d4..f369168 100644
>> --- a/drivers/extcon/extcon-class.c
>> +++ b/drivers/extcon/extcon-class.c
>> @@ -604,6 +604,64 @@ void extcon_dev_free(struct extcon_dev *edev)
>> }
>> EXPORT_SYMBOL_GPL(extcon_dev_free);
>>
>> +static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
>> +{
>> + struct extcon_dev **r = res;
>> +
>> + if (!r || !*r) {
>> + WARN_ON(!r || !*r);
>> + return 0;
>> + }
>> +
>> + return *r == data;
>> +}
>> +
>> +static void devm_extcon_dev_release(struct device *dev, void *res)
>> +{
>> + extcon_dev_free(*(struct extcon_dev **)res);
>> +}
>> +
>> +/**
>> + * devm_extcon_dev_allocate - Allocate managed extcon device
>> + * @dev: device owning the extcon device being created
>> + * @supported_cable: Array of supported cable names ending with NULL.
>> + * If supported_cable is NULL, cable name related APIs
>> + * are disabled.
>> + *
>> + * This function manages automatically the memory of extcon device using
>> device
>> + * resource management and simplify the control of freeing the memory of
>> extcon
>> + * device.
>> + *
>> + * Returns the pointer memory of allocated extcon_dev if success or NULL if
>> fail
>> + */
>> +struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
>> + const char **supported_cable)
>> +{
>> + struct extcon_dev **ptr, *edev;
>> +
>> + ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
>> + if (!ptr)
>> + return NULL;
>
> if this fails you return NULL;
>
>> +
>> + edev = extcon_dev_allocate(supported_cable);
>
> if this fails, you return -ENOMEM. Not very nice, if you ask me.
I'll fix it as following:
If both extcon_dev_allocate() and devm_excon_dev_allocate() failed to
allocate memory,
two functions would return NULL pointer instead of ERR_PTR(-ENOMEM).
Thanks,
Chanwoo Choi
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