int acpi_parse_trt()

in intel/int340x_thermal/acpi_thermal_rel.c [67:132]

• 55 lines of code
• 10 McCabe index (conditional complexity)

int acpi_parse_trt(acpi_handle handle, int *trt_count, struct trt **trtp,
		bool create_dev)
{
	acpi_status status;
	int result = 0;
	int i;
	int nr_bad_entries = 0;
	struct trt *trts;
	struct acpi_device *adev;
	union acpi_object *p;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_buffer element = { 0, NULL };
	struct acpi_buffer trt_format = { sizeof("RRNNNNNN"), "RRNNNNNN" };

	status = acpi_evaluate_object(handle, "_TRT", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	p = buffer.pointer;
	if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
		pr_err("Invalid _TRT data\n");
		result = -EFAULT;
		goto end;
	}

	*trt_count = p->package.count;
	trts = kcalloc(*trt_count, sizeof(struct trt), GFP_KERNEL);
	if (!trts) {
		result = -ENOMEM;
		goto end;
	}

	for (i = 0; i < *trt_count; i++) {
		struct trt *trt = &trts[i - nr_bad_entries];

		element.length = sizeof(struct trt);
		element.pointer = trt;

		status = acpi_extract_package(&(p->package.elements[i]),
					      &trt_format, &element);
		if (ACPI_FAILURE(status)) {
			nr_bad_entries++;
			pr_warn("_TRT package %d is invalid, ignored\n", i);
			continue;
		}
		if (!create_dev)
			continue;

		result = acpi_bus_get_device(trt->source, &adev);
		if (result)
			pr_warn("Failed to get source ACPI device\n");

		result = acpi_bus_get_device(trt->target, &adev);
		if (result)
			pr_warn("Failed to get target ACPI device\n");
	}

	result = 0;

	*trtp = trts;
	/* don't count bad entries */
	*trt_count -= nr_bad_entries;
end:
	kfree(buffer.pointer);
	return result;
}