linux-kernel - [PATCH AUTOSEL 5.18 37/41] nvme: use struct group for generic command dwords

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Date:   Thu, 14 Jul 2022 00:22:17 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Keith Busch <kbusch@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, axboe@...com,
        sagi@...mberg.me, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.18 37/41] nvme: use struct group for generic command dwords

From: Keith Busch <kbusch@...nel.org>

[ Upstream commit 5c629dc9609dc43492a7bc8060cc6120875bf096 ]

This will allow the trace event to know the full size of the data
intended to be copied and silence read overflow checks.

Reported-by: John Garry <john.garry@...wei.com>
Suggested-by: Christoph Hellwig <hch@....de>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/trace.h | 2 +-
 include/linux/nvme.h      | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/trace.h b/drivers/nvme/host/trace.h
index b5f85259461a..37c7f4c89f92 100644
--- a/drivers/nvme/host/trace.h
+++ b/drivers/nvme/host/trace.h
@@ -69,7 +69,7 @@ TRACE_EVENT(nvme_setup_cmd,
 		__entry->metadata = !!blk_integrity_rq(req);
 		__entry->fctype = cmd->fabrics.fctype;
 		__assign_disk_name(__entry->disk, req->q->disk);
-		memcpy(__entry->cdw10, &cmd->common.cdw10,
+		memcpy(__entry->cdw10, &cmd->common.cdws,
 			sizeof(__entry->cdw10));
 	    ),
 	    TP_printk("nvme%d: %sqid=%d, cmdid=%u, nsid=%u, flags=0x%x, meta=0x%x, cmd=(%s %s)",
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index f626a445d1a8..99b1b56f0cd3 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -867,12 +867,14 @@ struct nvme_common_command {
 	__le32			cdw2[2];
 	__le64			metadata;
 	union nvme_data_ptr	dptr;
+	struct_group(cdws,
 	__le32			cdw10;
 	__le32			cdw11;
 	__le32			cdw12;
 	__le32			cdw13;
 	__le32			cdw14;
 	__le32			cdw15;
+	);
 };
 
 struct nvme_rw_command {
-- 
2.35.1