static int __init einj_init()

in apei/einj.c [671:768]

• 84 lines of code
• 12 McCabe index (conditional complexity)

static int __init einj_init(void)
{
	int rc;
	acpi_status status;
	struct apei_exec_context ctx;

	if (acpi_disabled) {
		pr_info("ACPI disabled.\n");
		return -ENODEV;
	}

	status = acpi_get_table(ACPI_SIG_EINJ, 0,
				(struct acpi_table_header **)&einj_tab);
	if (status == AE_NOT_FOUND) {
		pr_warn("EINJ table not found.\n");
		return -ENODEV;
	}
	else if (ACPI_FAILURE(status)) {
		pr_err("Failed to get EINJ table: %s\n",
				acpi_format_exception(status));
		return -EINVAL;
	}

	rc = einj_check_table(einj_tab);
	if (rc) {
		pr_warn(FW_BUG "Invalid EINJ table.\n");
		goto err_put_table;
	}

	rc = -ENOMEM;
	einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());

	debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir,
			    NULL, &available_error_type_fops);
	debugfs_create_file_unsafe("error_type", 0600, einj_debug_dir,
				   NULL, &error_type_fops);
	debugfs_create_file_unsafe("error_inject", 0200, einj_debug_dir,
				   NULL, &error_inject_fops);

	apei_resources_init(&einj_resources);
	einj_exec_ctx_init(&ctx);
	rc = apei_exec_collect_resources(&ctx, &einj_resources);
	if (rc) {
		pr_err("Error collecting EINJ resources.\n");
		goto err_fini;
	}

	rc = apei_resources_request(&einj_resources, "APEI EINJ");
	if (rc) {
		pr_err("Error requesting memory/port resources.\n");
		goto err_fini;
	}

	rc = apei_exec_pre_map_gars(&ctx);
	if (rc) {
		pr_err("Error pre-mapping GARs.\n");
		goto err_release;
	}

	einj_param = einj_get_parameter_address();
	if ((param_extension || acpi5) && einj_param) {
		debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
				   &error_flags);
		debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
				   &error_param1);
		debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
				   &error_param2);
		debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
				   &error_param3);
		debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
				   &error_param4);
		debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
				   einj_debug_dir, &notrigger);
	}

	if (vendor_dev[0]) {
		vendor_blob.data = vendor_dev;
		vendor_blob.size = strlen(vendor_dev);
		debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
				    &vendor_blob);
		debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
				   einj_debug_dir, &vendor_flags);
	}

	pr_info("Error INJection is initialized.\n");

	return 0;

err_release:
	apei_resources_release(&einj_resources);
err_fini:
	apei_resources_fini(&einj_resources);
	debugfs_remove_recursive(einj_debug_dir);
err_put_table:
	acpi_put_table((struct acpi_table_header *)einj_tab);

	return rc;
}