On Thu, Apr 19, 2012 at 11:41:34AM +0900, MyungJoo Ham wrote:
> The generic GPIO extcon driver (an external connector device based on
> GPIO control) and imported from Android kernel.

Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

> +	ret = gpio_request(extcon_data->gpio, pdev->name);
> +	if (ret < 0)
> +		goto err_request_gpio;
> +
> +	ret = gpio_direction_input(extcon_data->gpio);
> +	if (ret < 0)
> +		goto err_set_gpio_input;

Incrementally (or in future versions) I'd suggest replacing with
gpio_request_one() which combines the above and is generally nicer.

> +static int __devexit gpio_extcon_remove(struct platform_device *pdev)
> +{
> +	struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev);
> +
> +	cancel_delayed_work_sync(&extcon_data->work);
> +	gpio_free(extcon_data->gpio);
> +	extcon_dev_unregister(&extcon_data->edev);
> +	devm_kfree(&pdev->dev, extcon_data);

The whole point of using devm_ is that you don't need to explicitly free
for this usage pattern.  On the other hand it does no harm.