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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: dff824b2aa ("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>
This commit is contained in:
Kevin Hao 2019-10-18 10:53:14 +08:00 committed by Keith Busch
parent 28a4cac48c
commit a4f40484e7
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/host/pci.c
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@ -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))