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nvme: clear any SGL flags in passthru commands

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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 <[email protected]>
Reviewed-by: Keith Busch <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Logan Gunthorpe authored and Christoph Hellwig committed 2020-07-29 07:45:20 +02:00
1 parent ece0278c1c
commit 2bf5d3bbff
1 file changed
+9 -1
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drivers/nvme/host/core.c
+9 -1
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@@ -604,6 +604,14 @@ static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
}
static void nvme_setup_passthrough(struct request *req,
struct nvme_command *cmd)
{
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;
}
static inline void nvme_setup_flush(struct nvme_ns *ns,
struct nvme_command *cmnd)
{
@@ -769,7 +777,7 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
switch (req_op(req)) {
case REQ_OP_DRV_IN:
case REQ_OP_DRV_OUT:
memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
nvme_setup_passthrough(req, cmd);
break;
case REQ_OP_FLUSH:
nvme_setup_flush(ns, cmd);