static int devm_register_dax_mapping()

in bus.c [741:780]

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

static int devm_register_dax_mapping(struct dev_dax *dev_dax, int range_id)
{
	struct dax_region *dax_region = dev_dax->region;
	struct dax_mapping *mapping;
	struct device *dev;
	int rc;

	device_lock_assert(dax_region->dev);

	if (dev_WARN_ONCE(&dev_dax->dev, !dax_region->dev->driver,
				"region disabled\n"))
		return -ENXIO;

	mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
	if (!mapping)
		return -ENOMEM;
	mapping->range_id = range_id;
	mapping->id = ida_alloc(&dev_dax->ida, GFP_KERNEL);
	if (mapping->id < 0) {
		kfree(mapping);
		return -ENOMEM;
	}
	dev_dax->ranges[range_id].mapping = mapping;
	dev = &mapping->dev;
	device_initialize(dev);
	dev->parent = &dev_dax->dev;
	dev->type = &dax_mapping_type;
	dev_set_name(dev, "mapping%d", mapping->id);
	rc = device_add(dev);
	if (rc) {
		put_device(dev);
		return rc;
	}

	rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_mapping,
			dev);
	if (rc)
		return rc;
	return 0;
}