linux-kernel - [PATCH v10 1/9] nvme-core: Clear any SGL flags in passthru commands

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Message-Id: <20200108174030.3430-2-logang@deltatee.com>
Date:   Wed,  8 Jan 2020 10:40:22 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v10 1/9] nvme-core: Clear any SGL flags in passthru commands

The host driver should decide whether to use SGLs or PRPs and they
currently assume the flags are cleared after the call to
nvme_setup_cmd(). However, passed-through commands may erroneously
set these bits; so clear them for all cases.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/nvme/host/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index dfe37a525f3a..f71566129d08 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -762,6 +762,8 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
 	case REQ_OP_DRV_IN:
 	case REQ_OP_DRV_OUT:
 		memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
+		/* passthru commands should let the driver set the SGL flags */
+		cmd->common.flags &= ~NVME_CMD_SGL_ALL;
 		break;
 	case REQ_OP_FLUSH:
 		nvme_setup_flush(ns, cmd);
-- 
2.20.1