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authorKevin Hao <haokexin@gmail.com>2019-10-18 10:53:14 +0800
committerKeith Busch <kbusch@kernel.org>2019-10-18 23:09:41 +0900
commita4f40484e7f1dff56bb9f286cc59ffa36e0259eb (patch)
tree5acd12c4cc9d9ce326cc62bf9d75afe8ac0d0719
parent28a4cac48c7e897a0b4e7d79a53a8e4fe40337ae (diff)
nvme-pci: Set the prp2 correctly when using more than 4k page
In the current code, the nvme is using a fixed 4k PRP entry size, but if the kernel use a page size which is more than 4k, we should consider the situation that the bv_offset may be larger than the dev->ctrl.page_size. Otherwise we may miss setting the prp2 and then cause the command can't be executed correctly. Fixes: dff824b2aadb ("nvme-pci: optimize mapping of small single segment requests") Cc: stable@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kevin Hao <haokexin@gmail.com> Signed-off-by: Keith Busch <kbusch@kernel.org>
-rw-r--r--drivers/nvme/host/pci.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 4b181969c432..869f462e6b6e 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -773,7 +773,8 @@ static blk_status_t nvme_setup_prp_simple(struct nvme_dev *dev,
struct bio_vec *bv)
{
struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
- unsigned int first_prp_len = dev->ctrl.page_size - bv->bv_offset;
+ unsigned int offset = bv->bv_offset & (dev->ctrl.page_size - 1);
+ unsigned int first_prp_len = dev->ctrl.page_size - offset;
iod->first_dma = dma_map_bvec(dev->dev, bv, rq_dma_dir(req), 0);
if (dma_mapping_error(dev->dev, iod->first_dma))