static int add_host_bridge_dport()

in acpi.c [310:351]

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

static int add_host_bridge_dport(struct device *match, void *arg)
{
	int rc;
	acpi_status status;
	unsigned long long uid;
	struct cxl_chbs_context ctx;
	struct cxl_port *root_port = arg;
	struct device *host = root_port->dev.parent;
	struct acpi_device *bridge = to_cxl_host_bridge(host, match);

	if (!bridge)
		return 0;

	status = acpi_evaluate_integer(bridge->handle, METHOD_NAME__UID, NULL,
				       &uid);
	if (status != AE_OK) {
		dev_err(host, "unable to retrieve _UID of %s\n",
			dev_name(match));
		return -ENODEV;
	}

	ctx = (struct cxl_chbs_context) {
		.dev = host,
		.uid = uid,
	};
	acpi_table_parse_cedt(ACPI_CEDT_TYPE_CHBS, cxl_get_chbcr, &ctx);

	if (ctx.chbcr == 0) {
		dev_warn(host, "No CHBS found for Host Bridge: %s\n",
			 dev_name(match));
		return 0;
	}

	rc = cxl_add_dport(root_port, match, uid, ctx.chbcr);
	if (rc) {
		dev_err(host, "failed to add downstream port: %s\n",
			dev_name(match));
		return rc;
	}
	dev_dbg(host, "add dport%llu: %s\n", uid, dev_name(match));
	return 0;
}