[PATCH v3 2/2] nvme: Fix error in nvme_setup_prps

[Jon Lin]

Consulting to "NVM Express® Base Specification, revision 2.0".

If more PRP List pages are required, then the last entry of
the PRP List contains the Page Base Address of the next PRP
List page. The next PRP List page shall be memory page aligned.

Signed-off-by: Jon Lin <jon.lin at rock-chips.com>
Reviewed-by: Shawn Lin <shawn.lin at rock-chips.com>
---

(no changes since v1)

 drivers/nvme/nvme.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c
index 9623c896a1..22ded626a5 100644
--- a/drivers/nvme/nvme.c
+++ b/drivers/nvme/nvme.c
@@ -100,7 +100,7 @@ static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2,
 	}
 
 	nprps = DIV_ROUND_UP(length, page_size);
-	num_pages = DIV_ROUND_UP(nprps, prps_per_page);
+	num_pages = DIV_ROUND_UP(nprps + 1, prps_per_page);
 
 	if (nprps > dev->prp_entry_num) {
 		free(dev->prp_pool);
@@ -119,10 +119,11 @@ static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2,
 	prp_pool = dev->prp_pool;
 	i = 0;
 	while (nprps) {
-		if (i == ((page_size >> 3) - 1)) {
-			*(prp_pool + i) = cpu_to_le64((ulong)prp_pool +
+		if (i == prps_per_page) {
+			*(prp_pool + i) = *(prp_pool + i - 1);
+			*(prp_pool + i - 1) = cpu_to_le64((ulong)prp_pool +
 					page_size);
-			i = 0;
+			i = 1;
 			prp_pool += page_size;
 		}
 		*(prp_pool + i++) = cpu_to_le64(dma_addr);
-- 
2.17.1