int virtio_finalize_features()

in virtio.c [169:204]

• 31 lines of code
• 7 McCabe index (conditional complexity)

int virtio_finalize_features(struct virtio_device *dev)
{
	int ret = dev->config->finalize_features(dev);
	unsigned status;

	might_sleep();
	if (ret)
		return ret;

	ret = arch_has_restricted_virtio_memory_access();
	if (ret) {
		if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
			dev_warn(&dev->dev,
				 "device must provide VIRTIO_F_VERSION_1\n");
			return -ENODEV;
		}

		if (!virtio_has_feature(dev, VIRTIO_F_ACCESS_PLATFORM)) {
			dev_warn(&dev->dev,
				 "device must provide VIRTIO_F_ACCESS_PLATFORM\n");
			return -ENODEV;
		}
	}

	if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1))
		return 0;

	virtio_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
	status = dev->config->get_status(dev);
	if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
		dev_err(&dev->dev, "virtio: device refuses features: %x\n",
			status);
		return -ENODEV;
	}
	return 0;
}