+ *
+ * @return
+ * - (0) if successful.
+ * - (-EINVAL) if port identifier is invalid.
+ * - (-ENOTSUP) if hardware doesn't support this function.
+ * - (-EPERM) if not ran from the primary process.
+ * - (-EIO) if re-initialisation failed.
+ * - (-ENOMEM) if the reset failed due to OOM.
+ * - (-EAGAIN) if the reset temporarily failed and should be retried later.