because if priv->rx_length is zero , need to call SPIS_CTRLR_QPOLL to receive new data from lower half and update priv->rx_length. This reverts commit 6cb649ecf6d537383eadb71a8a7ce780959ee8ad.
because if priv->rx_length is zero , need to call SPIS_CTRLR_QPOLL to receive new data from lower half and update priv->rx_length. This reverts commit 6cb649ecf6d537383eadb71a8a7ce780959ee8ad.