K 10 svn:author V 3 jhb K 8 svn:date V 27 2012-05-16T21:07:19.984504Z K 7 svn:log V 401 MFC 234152: Allow device_busy() and device_unbusy() to be invoked while a device is being attached. This is implemented by adding a new DS_ATTACHING state while a device's DEVICE_ATTACH() method is being invoked. A driver is required to not fail an attach of a busy device. The device's state will be promoted to DS_BUSY rather than DS_ACTIVE() if the device was marked busy during DEVICE_ATTACH() END