This driver adds an attribute to the existing virtio device so a CHANGE
event is required in order udev rules to make use of it. The ADD event
happens before this driver is probed and unlike a more typical driver
like a block device there isn't a higher level device to watch for.
Signed-off-by: NMichael Marineau <michael.marineau@coreos.com>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>