[PATCH v12 1/9] nvme-core: Clear any SGL flags in passthru commands

[Logan Gunthorpe]

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@xxxxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
---
 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 91c1bd659947..f5283b300e87 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -756,6 +756,8 @@ 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