4.x device failure?

[Sam]

> To recap, the AoE device is mounted and I unload the module.
> The unload procedure fails outstanding bufs for the device
> and waits for the device to be closed.  The close never comes.
> Umounting the filesystem fails because he tries to open the
> device, I see it's now gone, and return ENODEV.  "Device not configured"

I'm sorry, it's due to the strategy when i fail the buffer with
ENXIO (obviously).  Failing with EIO displays identical behaviour,
just a different error message.

Sam