linux-kernel - [PATCH 5.10 058/102] nvme-pci: allocate nvme

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Date:   Mon, 27 Jun 2022 13:21:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 058/102] nvme-pci: allocate nvme_command within driver pdu

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

[ Upstream commit af7fae857ea22e9c2aef812e1321d9c5c206edde ]

Except for pci, all the nvme transport drivers allocate a command within
the driver's pdu. Align pci with everyone else by allocating the nvme
command within pci's pdu and replace the .queue_rq() stack variable with
this.

Signed-off-by: Keith Busch <kbusch@...nel.org>
Reviewed-by: Jens Axboe <axboe@...nel.dk>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/pci.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 07a4d5d387cd..31c6938e5045 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -224,6 +224,7 @@ struct nvme_queue {
  */
 struct nvme_iod {
 	struct nvme_request req;
+	struct nvme_command cmd;
 	struct nvme_queue *nvmeq;
 	bool use_sgl;
 	int aborted;
@@ -917,7 +918,7 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
 	struct nvme_dev *dev = nvmeq->dev;
 	struct request *req = bd->rq;
 	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
-	struct nvme_command cmnd;
+	struct nvme_command *cmnd = &iod->cmd;
 	blk_status_t ret;
 
 	iod->aborted = 0;
@@ -931,24 +932,24 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (unlikely(!test_bit(NVMEQ_ENABLED, &nvmeq->flags)))
 		return BLK_STS_IOERR;
 
-	ret = nvme_setup_cmd(ns, req, &cmnd);
+	ret = nvme_setup_cmd(ns, req, cmnd);
 	if (ret)
 		return ret;
 
 	if (blk_rq_nr_phys_segments(req)) {
-		ret = nvme_map_data(dev, req, &cmnd);
+		ret = nvme_map_data(dev, req, cmnd);
 		if (ret)
 			goto out_free_cmd;
 	}
 
 	if (blk_integrity_rq(req)) {
-		ret = nvme_map_metadata(dev, req, &cmnd);
+		ret = nvme_map_metadata(dev, req, cmnd);
 		if (ret)
 			goto out_unmap_data;
 	}
 
 	blk_mq_start_request(req);
-	nvme_submit_cmd(nvmeq, &cmnd, bd->last);
+	nvme_submit_cmd(nvmeq, cmnd, bd->last);
 	return BLK_STS_OK;
 out_unmap_data:
 	nvme_unmap_data(dev, req);
-- 
2.35.1