[PATCH 2/4] NVMe: Sync stopped queues with block layer

[Keith Busch]

On Thu, Feb 04, 2016 at 05:57:07PM +0200, Sagi Grimberg wrote:
> 
> >Make sure no work will submit requests to a stopped h/w queue.
> 
> Not sure what that buys us, and it's not documented. But
> I don't mind having it. Can you provide a better explanation
> why it's added?

This was trying to close that gap with requests queueing on stopped h/w
queues and writing the queue doorbell. It works for requests through
the kblock_workqueue, but that's not always the case, so it's only a
partial solution.