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nvme-pci: clear the prp2 field when not used

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If the prp2 field is not filled in nvme_setup_prp_simple(), the prp2
field is garbage data. According to nvme spec, the prp2 is reserved if
the data transfer does not cross a memory page boundary, so clear it to
zero if it is not used.

Signed-off-by: Lei Rao <lei.rao@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Lei Rao 2022-11-29 17:48:11 +08:00 • committed by Christoph Hellwig
parent 7d4a93176e
commit a56ea6147f
1 changed files with 2 additions and 0 deletions
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2
drivers/nvme/host/pci.c
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@ -797,6 +797,8 @@ static blk_status_t nvme_setup_prp_simple(struct nvme_dev *dev,
cmnd->dptr.prp1 = cpu_to_le64(iod->first_dma); cmnd->dptr.prp1 = cpu_to_le64(iod->first_dma);
if (bv->bv_len > first_prp_len) if (bv->bv_len > first_prp_len)
cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma + first_prp_len); cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma + first_prp_len);
else
cmnd->dptr.prp2 = 0;
return BLK_STS_OK; return BLK_STS_OK;
} }