Re: [Xen-devel] xl dev-detach hangs with missing frontends

[Olaf Hering <olaf@xxxxxxxxx>]

On Fri, Feb 12, Wei Liu wrote:

> CC'ing other tools maintainer.
> 
> On Thu, Feb 11, 2016 at 11:37:49AM +0100, Olaf Hering wrote:
> > How should libxl__initiate_device_generic_remove deal with devices which
> 
> I think you meant libxl__initiate_device_remove. There is no function
> called libxl__initiate_device_generic _remove.

Not yet.

> > have no frontend driver? Right now it moves "state" from either
> > XenbusStateInitialising or XenbusStateInitWait to XenbusStateClosing.
> > Then it expects the backend to move "state" to XenbusStateClosed. This
> > will never happen, at least for netback and scsiback. The result is a 10
> > second delay.
> > 
> 
> I don't think there is a way to tell whether there is no frontend driver
> or the frontend driver is just too slow.

To handle this the code should check the current value of "state". If
its XenbusStateInitialising or XenbusStateInitWait nothing should be
done.

Olaf

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