[PATCH] nvme: allow queues the chance to quiesce after freezing them

[Jon Derrick]

> I think all we really want is skip notifying completions on a
> "suspended" queue. We can tell by the value of the cq-vector,
> and it's already lock protected.
> 
Good catch. I wish I had made that relationship :)
(Though I was hoping somebody would figure out a less hacky way of doing it than I did)

> It also sounds like we need to poll the cq after the delete completes
> to catch successful completions before we force cancel the rest.
>
> This appears to work for me. Does it pass your test?

Passes my tests as well so you can add my tb:
Tested-by: Jon Derrick <jonathan.derrick at intel.com>

Re: Christoph
>This looks reasonable.  I ran into stray ->q_db derference a lot during reset testing, but after my abort and reset rewrites ([1] for th latest
version) I couldn't reproduce it any more. 

Sorry this was against 4.3 (and was reproducible on 4.4-rc1). I will give your repo a test shortly