blk_rq_dma_map_iter_next
EXPORT_SYMBOL_GPL(blk_rq_dma_map_iter_next);
} while (blk_rq_dma_map_iter_next(req, nvmeq->dev->dev, iter));
if (!blk_rq_dma_map_iter_next(req, dma_dev, iter))
bool blk_rq_dma_map_iter_next(struct request *req, struct device *dma_dev,