Re: [PATCH] nvme-pci: fix dma unmapping when using PRPs and not using the IOVA mapping

[Christoph Hellwig <hch@xxxxxx>]

Hi Klara,

can you try the attached patch?

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6af184f2b73b..ac3b90d31380 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -745,7 +745,7 @@ static bool nvme_pci_prp_iter_next(struct request *req, struct device *dma_dev,
 		return true;
 	if (!blk_rq_dma_map_iter_next(req, dma_dev, &iod->dma_state, iter))
 		return false;
-	if (dma_need_unmap(dma_dev)) {
+	if (!dma_use_iova(&iod->dma_state) && dma_need_unmap(dma_dev)) {
 		iod->dma_vecs[iod->nr_dma_vecs].addr = iter->addr;
 		iod->dma_vecs[iod->nr_dma_vecs].len = iter->len;
 		iod->nr_dma_vecs++;
@@ -763,7 +763,7 @@ static blk_status_t nvme_pci_setup_data_prp(struct request *req,
 	unsigned int prp_len, i;
 	__le64 *prp_list;
 
-	if (dma_need_unmap(nvmeq->dev->dev)) {
+	if (!dma_use_iova(&iod->dma_state) && dma_need_unmap(nvmeq->dev->dev)) {
 		iod->dma_vecs = mempool_alloc(nvmeq->dev->dmavec_mempool,
 				GFP_ATOMIC);
 		if (!iod->dma_vecs)