HIFN_FLAG_SRC_BUSY
if (!(dev->flags & HIFN_FLAG_SRC_BUSY)) {
dev->flags |= HIFN_FLAG_SRC_BUSY;
if (dma->srcu == 0 && (dev->flags & HIFN_FLAG_SRC_BUSY)) {
dev->flags &= ~HIFN_FLAG_SRC_BUSY;