static int of_pmem_region_probe()

in of_pmem.c [17:79]

• 49 lines of code
• 8 McCabe index (conditional complexity)

static int of_pmem_region_probe(struct platform_device *pdev)
{
	struct of_pmem_private *priv;
	struct device_node *np;
	struct nvdimm_bus *bus;
	bool is_volatile;
	int i;

	np = dev_of_node(&pdev->dev);
	if (!np)
		return -ENXIO;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->bus_desc.provider_name = kstrdup(pdev->name, GFP_KERNEL);
	priv->bus_desc.module = THIS_MODULE;
	priv->bus_desc.of_node = np;

	priv->bus = bus = nvdimm_bus_register(&pdev->dev, &priv->bus_desc);
	if (!bus) {
		kfree(priv);
		return -ENODEV;
	}
	platform_set_drvdata(pdev, priv);

	is_volatile = !!of_find_property(np, "volatile", NULL);
	dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
			is_volatile ? "volatile" : "non-volatile",  np);

	for (i = 0; i < pdev->num_resources; i++) {
		struct nd_region_desc ndr_desc;
		struct nd_region *region;

		/*
		 * NB: libnvdimm copies the data from ndr_desc into it's own
		 * structures so passing a stack pointer is fine.
		 */
		memset(&ndr_desc, 0, sizeof(ndr_desc));
		ndr_desc.numa_node = dev_to_node(&pdev->dev);
		ndr_desc.target_node = ndr_desc.numa_node;
		ndr_desc.res = &pdev->resource[i];
		ndr_desc.of_node = np;
		set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);

		if (is_volatile)
			region = nvdimm_volatile_region_create(bus, &ndr_desc);
		else {
			set_bit(ND_REGION_PERSIST_MEMCTRL, &ndr_desc.flags);
			region = nvdimm_pmem_region_create(bus, &ndr_desc);
		}

		if (!region)
			dev_warn(&pdev->dev, "Unable to register region %pR from %pOF\n",
					ndr_desc.res, np);
		else
			dev_dbg(&pdev->dev, "Registered region %pR from %pOF\n",
					ndr_desc.res, np);
	}

	return 0;
}