[PATCH] NVMe: Skip async events for degraded controllers

[Christoph Hellwig]

On Fri, Apr 08, 2016 at 04:09:56PM -0600, Keith Busch wrote:
> If the controller is degraded, the driver should stay out of the way so
> the user can recover the drive. This patch skips driver initiated async
> event requests when the drive is in this state.
> 
> Signed-off-by: Keith Busch <keith.busch at intel.com>
> ---
> This is to fix communication with a specific controller, but I thought
> this was generally applicable anyway. If anyone really wants to see async
> events on degraded controllers, I can provide this as a quirk instead.

Hah, I was going to prepare something fairly similar for Fabrics
enablement, so I'm fine with it.  But a comment on why we're doing
this would be really nice.  I wonder if we should simply have a
wrapper function for the queue_count check that has a descriptive
and has the detailed description might be useful.