Roland Dreier wrote:
    Sean> Is there a way for a userspace application to know if a
    Sean> device has been added or removed?

We don't really handle this right now.  It could probably be made to
work on top of hotplug/udev/hal/something but it seems tricky to me.

Any idea on how we currently want to handle this? Can a device remove occur if a usermode app is using the device?

The kernel CMA will block until all connection identifiers associated with the removed device are freed. I export the device removal up to userspace through the uCMA, but that leaves the kernel blocked until the userspace application cleans up. Doing something more intelligent requires a lot more effort.

- Sean
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