static ssize_t size_store()

in bus.c [1035:1063]

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

static ssize_t size_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t len)
{
	ssize_t rc;
	unsigned long long val;
	struct dev_dax *dev_dax = to_dev_dax(dev);
	struct dax_region *dax_region = dev_dax->region;

	rc = kstrtoull(buf, 0, &val);
	if (rc)
		return rc;

	if (!alloc_is_aligned(dev_dax, val)) {
		dev_dbg(dev, "%s: size: %lld misaligned\n", __func__, val);
		return -EINVAL;
	}

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

	return rc == 0 ? len : rc;
}