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

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Message-Id: <20221129014711.91305-1-lei.rao@intel.com>
Date:   Tue, 29 Nov 2022 09:47:11 +0800
From:   Lei Rao <lei.rao@...el.com>
To:     kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Lei Rao <lei.rao@...el.com>
Subject: [PATCH] nvme: clear the prp2 field of the nvme command.

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_rw().

Signed-off-by: Lei Rao <lei.rao@...el.com>
---
 drivers/nvme/host/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index da55ce45ac70..332367b66fbe 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -891,6 +891,7 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
 	cmnd->rw.reftag = 0;
 	cmnd->rw.apptag = 0;
 	cmnd->rw.appmask = 0;
+	cmnd->rw.dptr.prp2 = 0;
 
 	if (ns->ms) {
 		/*
-- 
2.34.1