static ssize_t bin_attr_nvmem_read()

in core.c [210:248]

• 28 lines of code
• 8 McCabe index (conditional complexity)

static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj,
				   struct bin_attribute *attr, char *buf,
				   loff_t pos, size_t count)
{
	struct device *dev;
	struct nvmem_device *nvmem;
	int rc;

	if (attr->private)
		dev = attr->private;
	else
		dev = kobj_to_dev(kobj);
	nvmem = to_nvmem_device(dev);

	/* Stop the user from reading */
	if (pos >= nvmem->size)
		return 0;

	if (!IS_ALIGNED(pos, nvmem->stride))
		return -EINVAL;

	if (count < nvmem->word_size)
		return -EINVAL;

	if (pos + count > nvmem->size)
		count = nvmem->size - pos;

	count = round_down(count, nvmem->word_size);

	if (!nvmem->reg_read)
		return -EPERM;

	rc = nvmem_reg_read(nvmem, pos, buf, count);

	if (rc)
		return rc;

	return count;
}