+static inline void nvme_complete_failed_req(struct request *req)

I think the name is too generic, and the function also needs a little
comment, especially as it forces a specific error code.

+{
+	nvme_req(req)->status = NVME_SC_HOST_PATH_ERROR;
+	blk_mq_set_request_complete(req);
+	nvme_complete_rq(req);
+}

Also no need to mark this as an inline function.