MTK_DMA_DUMMY_DESC
if (tx_buf->data && tx_buf->data != (void *)MTK_DMA_DUMMY_DESC) {
tx_buf->data = (void *)MTK_DMA_DUMMY_DESC;
tx_buf->data = (void *)MTK_DMA_DUMMY_DESC;
tx_buf->data = (void *)MTK_DMA_DUMMY_DESC;
if (tx_buf->data != (void *)MTK_DMA_DUMMY_DESC) {
if (tx_buf->data != (void *)MTK_DMA_DUMMY_DESC) {