handle_drain_completion
handle_drain_completion(cq, &sdrain, hr_dev);
handle_drain_completion(cq, &rdrain, hr_dev);
handle_drain_completion(cq, &sdrain, dev);
handle_drain_completion(cq, &rdrain, dev);
handle_drain_completion(cq, &sdrain, dev);
handle_drain_completion(cq, &rdrain, dev);