[RFC 2/3] nvme: passthrough helper with callback

[Kanchan Joshi]

This is a prep patch, so that ioctl completion can be decoupled from
submission.

Signed-off-by: Kanchan Joshi <joshi.k at samsung.com>
---
 drivers/nvme/host/core.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index e68a8c4ac5a6..15c9490b593f 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1126,7 +1126,8 @@ static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
 	}
 }
 
-void nvme_execute_passthru_rq(struct request *rq)
+void nvme_execute_passthru_rq_common(struct request *rq,
+			rq_end_io_fn *done)
 {
 	struct nvme_command *cmd = nvme_req(rq)->cmd;
 	struct nvme_ctrl *ctrl = nvme_req(rq)->ctrl;
@@ -1135,9 +1136,17 @@ void nvme_execute_passthru_rq(struct request *rq)
 	u32 effects;
 
 	effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode);
-	blk_execute_rq(disk, rq, 0);
+	if (!done)
+		blk_execute_rq(disk, rq, 0);
+	else
+		blk_execute_rq_nowait(disk, rq, 0, done);
 	nvme_passthru_end(ctrl, effects);
 }
+
+void nvme_execute_passthru_rq(struct request *rq)
+{
+	return nvme_execute_passthru_rq_common(rq, NULL);
+}
 EXPORT_SYMBOL_NS_GPL(nvme_execute_passthru_rq, NVME_TARGET_PASSTHRU);
 
 static int nvme_submit_user_cmd(struct request_queue *q,
-- 
2.25.1