static int adjust_dev_dax_range()

in bus.c [843:872]

• 24 lines of code
• 4 McCabe index (conditional complexity)

static int adjust_dev_dax_range(struct dev_dax *dev_dax, struct resource *res, resource_size_t size)
{
	int last_range = dev_dax->nr_range - 1;
	struct dev_dax_range *dax_range = &dev_dax->ranges[last_range];
	struct dax_region *dax_region = dev_dax->region;
	bool is_shrink = resource_size(res) > size;
	struct range *range = &dax_range->range;
	struct device *dev = &dev_dax->dev;
	int rc;

	device_lock_assert(dax_region->dev);

	if (dev_WARN_ONCE(dev, !size, "deletion is handled by dev_dax_shrink\n"))
		return -EINVAL;

	rc = adjust_resource(res, range->start, size);
	if (rc)
		return rc;

	*range = (struct range) {
		.start = range->start,
		.end = range->start + size - 1,
	};

	dev_dbg(dev, "%s range[%d]: %#llx:%#llx\n", is_shrink ? "shrink" : "extend",
			last_range, (unsigned long long) range->start,
			(unsigned long long) range->end);

	return 0;
}