static ssize_t align_store()

in bus.c [1153:1189]

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

static ssize_t align_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;
	unsigned long val, align_save;
	ssize_t rc;

	rc = kstrtoul(buf, 0, &val);
	if (rc)
		return -ENXIO;

	if (!dax_align_valid(val))
		return -EINVAL;

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

	device_lock(dev);
	if (dev->driver) {
		rc = -EBUSY;
		goto out_unlock;
	}

	align_save = dev_dax->align;
	dev_dax->align = val;
	rc = dev_dax_validate_align(dev_dax);
	if (rc)
		dev_dax->align = align_save;
out_unlock:
	device_unlock(dev);
	device_unlock(dax_region->dev);
	return rc == 0 ? len : rc;
}