[PATCH] nvme: Inform controller of doorbell config before unquiescing IO queues

[Keith Busch]

On Wed, Jan 10, 2024 at 06:28:55PM +0000, William Butler wrote:
> During resets, if queues are unquiesced first, then the host can submit
> IOs to the controller using shadow doorbell logic but the controller
> won't be aware. This can lead to necessary MMIO doorbells from being
> not issued, causing requests to be delayed and timed-out.

Good catch. I guess we wouldn't normally expect any requests to be in
queue at this point, but plenty of reasons it could happen.

Applied to nvme-6.8 with a slightly updated title to match the local
conventions.