static ssize_t mapping_store()

in bus.c [1096:1124]

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

static ssize_t mapping_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t len)
{
	struct dev_dax *dev_dax = to_dev_dax(dev);
	struct dax_region *dax_region = dev_dax->region;
	size_t to_alloc;
	struct range r;
	ssize_t rc;

	rc = range_parse(buf, len, &r);
	if (rc)
		return rc;

	rc = -ENXIO;
	device_lock(dax_region->dev);
	if (!dax_region->dev->driver) {
		device_unlock(dax_region->dev);
		return rc;
	}
	device_lock(dev);

	to_alloc = range_len(&r);
	if (alloc_is_aligned(dev_dax, to_alloc))
		rc = alloc_dev_dax_range(dev_dax, r.start, to_alloc);
	device_unlock(dev);
	device_unlock(dax_region->dev);

	return rc == 0 ? len : rc;
}