static ssize_t cfam_read()

in fsi-core.c [694:728]

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

static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count,
			 loff_t *offset)
{
	struct fsi_slave *slave = filep->private_data;
	size_t total_len, read_len;
	loff_t off = *offset;
	ssize_t rc;

	if (off < 0)
		return -EINVAL;

	if (off > 0xffffffff || count > 0xffffffff || off + count > 0xffffffff)
		return -EINVAL;

	for (total_len = 0; total_len < count; total_len += read_len) {
		__be32 data;

		read_len = min_t(size_t, count, 4);
		read_len -= off & 0x3;

		rc = fsi_slave_read(slave, off, &data, read_len);
		if (rc)
			goto fail;
		rc = copy_to_user(buf + total_len, &data, read_len);
		if (rc) {
			rc = -EFAULT;
			goto fail;
		}
		off += read_len;
	}
	rc = count;
 fail:
	*offset = off;
	return rc;
}