nvme-multipath: fix io accounting on failover

There are io stats accounting that needs to be handled, so don't call
blk_mq_end_request() directly. Use the existing nvme_end_req() helper
that already handles everything.

Fixes: d4d957b5 ("nvme-multipath: support io stats on the mpath device")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/core.c

@@ -422,7 +422,7 @@ static inline void __nvme_end_req(struct request *req)
 		nvme_mpath_end_request(req);
 }
 
-static inline void nvme_end_req(struct request *req)
+void nvme_end_req(struct request *req)
 {
 	blk_status_t status = nvme_error_status(nvme_req(req)->status);
 

drivers/nvme/host/multipath.c

@@ -118,7 +118,8 @@ void nvme_failover_req(struct request *req)
 	blk_steal_bios(&ns->head->requeue_list, req);
 	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
 
-	blk_mq_end_request(req, 0);
+	nvme_req(req)->status = 0;
+	nvme_end_req(req);
 	kblockd_schedule_work(&ns->head->requeue_work);
 }
 

drivers/nvme/host/nvme.h

@@ -767,6 +767,7 @@ static inline bool nvme_state_terminal(struct nvme_ctrl *ctrl)
 	}
 }
 
+void nvme_end_req(struct request *req);
 void nvme_complete_rq(struct request *req);
 void nvme_complete_batch_req(struct request *req);