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nvme-pci: clear the prp2 field when not used
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>
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@ -797,6 +797,8 @@ static blk_status_t nvme_setup_prp_simple(struct nvme_dev *dev,
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cmnd->dptr.prp1 = cpu_to_le64(iod->first_dma);
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if (bv->bv_len > first_prp_len)
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cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma + first_prp_len);
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else
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cmnd->dptr.prp2 = 0;
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return BLK_STS_OK;
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}
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