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/** * input_register_handle - register a new input handle * @handle: handle to register * * This function puts a new input handle onto device's * and handler's lists so that events can flow through * it once it is opened using input_open_device(). * * This function is supposed to be called from handler's * connect() method. */int input_register_handle(struct input_handle *handle){	struct input_handler *handler = handle->handler;	struct input_dev *dev = handle->dev;	int error;	/*	 * We take dev->mutex here to prevent race with	 * input_release_device().	 */	error = mutex_lock_interruptible(&dev->mutex);	if (error)		return error;	/*	 * Filters go to the head of the list, normal handlers	 * to the tail.	 */	if (handler->filter)		list_add_rcu(&handle->d_node, &dev->h_list);	else		list_add_tail_rcu(&handle->d_node, &dev->h_list);	mutex_unlock(&dev->mutex);	/*	 * Since we are supposed to be called from ->connect()	 * which is mutually exclusive with ->disconnect()	 * we can't be racing with input_unregister_handle()	 * and so separate lock is not needed here.	 */	list_add_tail_rcu(&handle->h_node, &handler->h_list);	if (handler->start)		handler->start(handle);	return 0;}

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