[PATCH] nvme: clear the prp2 field of the nvme command.

[Lei Rao <lei.rao@intel.com>]

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. Writing a
reserved coded value into a controller property field produces undefined
results, so it needs to be cleared in nvme_setup_prp_simple().

Signed-off-by: Lei Rao <lei.rao@intel.com>
---
 drivers/nvme/host/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index f4335519399d..488ad7dabeb8 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -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);
 	if (bv->bv_len > first_prp_len)
 		cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma + first_prp_len);
+	else
+		cmnd->dptr.prp2 = 0;
 	return BLK_STS_OK;
 }
 
-- 
2.34.1