static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
				   struct snd_ctl_elem_value __user *_control)
{
	struct snd_ctl_elem_value *control;
	struct snd_card *card;
	int result;

	control = memdup_user(_control, sizeof(*control));
	if (IS_ERR(control))
		return PTR_ERR(control);

	card = file->card;
	result = snd_ctl_elem_write(card, file, control);
	if (result < 0)
		goto error;

	if (copy_to_user(_control, control, sizeof(*control)))
		result = -EFAULT;
 error:
	kfree(control);
	return result;
}
static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
				   struct snd_ctl_elem_value __user *_control)
{
	struct snd_ctl_elem_value *control;
	struct snd_card *card;
	int result;

	control = memdup_user(_control, sizeof(*control));
	if (IS_ERR(control))
		return PTR_ERR(control);

	card = file->card;
	result = snd_ctl_elem_write(card, file, control);
	if (result < 0)
		goto error;

	if (copy_to_user(_control, control, sizeof(*control)))
		result = -EFAULT;
 error:
	kfree(control);
	return result;
}