static __poll_t uio_poll()

in uio.c [545:563]

• 16 lines of code
• 5 McCabe index (conditional complexity)

static __poll_t uio_poll(struct file *filep, poll_table *wait)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;
	__poll_t ret = 0;

	mutex_lock(&idev->info_lock);
	if (!idev->info || !idev->info->irq)
		ret = -EIO;
	mutex_unlock(&idev->info_lock);

	if (ret)
		return ret;

	poll_wait(filep, &idev->wait, wait);
	if (listener->event_count != atomic_read(&idev->event))
		return EPOLLIN | EPOLLRDNORM;
	return 0;
}