int pnpacpi_build_resource_template()

in pnpacpi/rsparser.c [621:656]

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

int pnpacpi_build_resource_template(struct pnp_dev *dev,
				    struct acpi_buffer *buffer)
{
	struct acpi_device *acpi_dev = dev->data;
	acpi_handle handle = acpi_dev->handle;
	struct acpi_resource *resource;
	int res_cnt = 0;
	acpi_status status;

	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
				     pnpacpi_count_resources, &res_cnt);
	if (ACPI_FAILURE(status)) {
		dev_err(&dev->dev, "can't evaluate _CRS: %d\n", status);
		return -EINVAL;
	}
	if (!res_cnt)
		return -EINVAL;
	buffer->length = sizeof(struct acpi_resource) * (res_cnt + 1) + 1;
	buffer->pointer = kzalloc(buffer->length - 1, GFP_KERNEL);
	if (!buffer->pointer)
		return -ENOMEM;

	resource = (struct acpi_resource *)buffer->pointer;
	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
				     pnpacpi_type_resources, &resource);
	if (ACPI_FAILURE(status)) {
		kfree(buffer->pointer);
		dev_err(&dev->dev, "can't evaluate _CRS: %d\n", status);
		return -EINVAL;
	}
	/* resource will pointer the end resource now */
	resource->type = ACPI_RESOURCE_TYPE_END_TAG;
	resource->length = sizeof(struct acpi_resource);

	return 0;
}