static int virtio_pmem_probe()

in virtio_pmem.c [32:100]

• 61 lines of code
• 6 McCabe index (conditional complexity)

static int virtio_pmem_probe(struct virtio_device *vdev)
{
	struct nd_region_desc ndr_desc = {};
	int nid = dev_to_node(&vdev->dev);
	struct nd_region *nd_region;
	struct virtio_pmem *vpmem;
	struct resource res;
	int err = 0;

	if (!vdev->config->get) {
		dev_err(&vdev->dev, "%s failure: config access disabled\n",
			__func__);
		return -EINVAL;
	}

	vpmem = devm_kzalloc(&vdev->dev, sizeof(*vpmem), GFP_KERNEL);
	if (!vpmem) {
		err = -ENOMEM;
		goto out_err;
	}

	vpmem->vdev = vdev;
	vdev->priv = vpmem;
	err = init_vq(vpmem);
	if (err) {
		dev_err(&vdev->dev, "failed to initialize virtio pmem vq's\n");
		goto out_err;
	}

	virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
			start, &vpmem->start);
	virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
			size, &vpmem->size);

	res.start = vpmem->start;
	res.end   = vpmem->start + vpmem->size - 1;
	vpmem->nd_desc.provider_name = "virtio-pmem";
	vpmem->nd_desc.module = THIS_MODULE;

	vpmem->nvdimm_bus = nvdimm_bus_register(&vdev->dev,
						&vpmem->nd_desc);
	if (!vpmem->nvdimm_bus) {
		dev_err(&vdev->dev, "failed to register device with nvdimm_bus\n");
		err = -ENXIO;
		goto out_vq;
	}

	dev_set_drvdata(&vdev->dev, vpmem->nvdimm_bus);

	ndr_desc.res = &res;
	ndr_desc.numa_node = nid;
	ndr_desc.flush = async_pmem_flush;
	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
	set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
	nd_region = nvdimm_pmem_region_create(vpmem->nvdimm_bus, &ndr_desc);
	if (!nd_region) {
		dev_err(&vdev->dev, "failed to create nvdimm region\n");
		err = -ENXIO;
		goto out_nd;
	}
	nd_region->provider_data = dev_to_virtio(nd_region->dev.parent->parent);
	return 0;
out_nd:
	nvdimm_bus_unregister(vpmem->nvdimm_bus);
out_vq:
	vdev->config->del_vqs(vdev);
out_err:
	return err;
}