[PATCH V3 4/6] nvme: paring quiesce/unquiesce

[Christoph Hellwig]

On Tue, Oct 12, 2021 at 11:01:48PM +0800, Ming Lei wrote:
> There are lots of unbalanced usage in nvme, such as
> 
> 1) nvme pci:
> 
> - nvme_dev_disable() can be called more than one times before starting
> reset, so multiple nvme_stop_queues() vs. single nvme_start_queues().
> 
> 2) Forcibly unquiesce queues in nvme_kill_queues() even though queues
> are never quiesced, and similar usage can be seen in tcp/fc/rdma too
> 
> Once the quiesce and unquiesce are run from difference context, it becomes
> not easy to audit if the two is done in pair.

Yes, but I'm not sure a magic flag is really the solution here.
I think we need to work on our state machine here so that this is less
of a mess.