[PATCHv4 2/4] nvme: Start controller in own work queue

[keith.busch@linux.intel.com (Keith Busch)]

On Mon, Jul 16, 2018@06:00:38PM +0300, Sagi Grimberg wrote:
> 
> > This moves the controller start from the reset_work to its own work.
> > This is preparing for the possibility of running IO when starting the
> > controller, which we shouldn't do from the reset_work since we need that
> > context to handle timeouts.
> 
> What do you mean handle timeouts? the timeout handler is not invoked
> from the reset_work thread.

Not directly. If you dispatch blocking IO from the reset_work, the timeout
handler will eventually be invoked if the IO never returns. This series
is really just trying to get all the blocking IO out of the reset_work
because IO may requeue when the timeout handler disables the controller,
and we need the reset_work to restart the controller.