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 <log...@deltatee.com>
Reviewed-by: Sagi Grimberg <s...@grimberg.me>
---
drivers/nvme/host/core.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 1d7c7afb1348..6f80bd78eba6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -593,6 +593,14 @@ 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)
{
@@ -758,7 +766,7 @@ 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);
--
2.20.1
