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Input: add comments to input_{allocate|free}_device()

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Hopefully this will stop people from using input_free_device()
incorrectly.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2006-11-02 23:26:55 -05:00
parent b435fdcda1
commit 1447190e39
1 changed files with 24 additions and 1 deletions
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25
drivers/input/input.c
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@ -37,7 +37,7 @@ static struct input_handler *input_table[8];
/**
* input_event() - report new input event
* @handle: device that generated the event
* @dev: device that generated the event
* @type: type of the event
* @code: event code
* @value: value of the event
@ -900,6 +900,15 @@ struct class input_class = {
};
EXPORT_SYMBOL_GPL(input_class);
/**
* input_allocate_device - allocate memory for new input device
*
* Returns prepared struct input_dev or NULL.
*
* NOTE: Use input_free_device() to free devices that have not been
* registered; input_unregister_device() should be used for already
* registered devices.
*/
struct input_dev *input_allocate_device(void)
{
struct input_dev *dev;
@ -919,6 +928,20 @@ struct input_dev *input_allocate_device(void)
}
EXPORT_SYMBOL(input_allocate_device);
/**
* input_free_device - free memory occupied by input_dev structure
* @dev: input device to free
*
* This function should only be used if input_register_device()
* was not called yet or if it failed. Once device was registered
* use input_unregister_device() and memory will be freed once last
* refrence to the device is dropped.
*
* Device should be allocated by input_allocate_device().
*
* NOTE: If there are references to the input device then memory
* will not be freed until last reference is dropped.
*/
void input_free_device(struct input_dev *dev)
{
if (dev) {