Re: [PATCH 1/4] block: have plug stored requests hold references to the queue

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

> @@ -1643,7 +1643,7 @@ void blk_flush_plug(struct blk_plug *plug, bool from_schedule)
>  		flush_plug_callbacks(plug, from_schedule);
>  	if (!rq_list_empty(plug->mq_list))
>  		blk_mq_flush_plug_list(plug, from_schedule);
> -	if (unlikely(!from_schedule && plug->cached_rq))
> +	if (unlikely(!rq_list_empty(plug->cached_rq)))

How is this related to the rest of the patch?