Re: [PATCH 2/6] nvme-pci: fix the freeze and quiesce for shutdown and reset case

[Keith Busch]

On Mon, Feb 05, 2018 at 10:26:03AM +0800, jianchao.wang wrote:
> > Freezing is not just for shutdown. It's also used so
> > blk_mq_update_nr_hw_queues will work if the queue count changes across
> > resets.
> blk_mq_update_nr_hw_queues will freeze the queue itself. Please refer to.
> static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,

Yes, but how many requests are you letting enter to their demise by
freezing on the wrong side of the reset? We don't use the nuclear option
out of convenience.