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IOSerialDriverSync disconnect

Hello,

I have an USB driver MyDriver that inherits from IOSerialDriverSync and that is used with pppd to communicate over IP with the device.  When I remove the device from the machine the connection does not terminate properly and the driver remains in the registry.  Moreover, when I plug in the cable again, the driver does not respond anymore until I reboot.  The output of ioreg after the usb cable has been unplugged (MyDriver is the class of the driver):

    | |   | +-o AppleUSBOHCI  <class AppleUSBOHCI, registered, matched, active, busy 1, retain count 11>
    | |   |   +-o OHCI Root Hub Simulation@18  <class IOUSBRootHubDevice, registered, matched, active, busy 0, retain count 12>
    | |   |   | +-o AppleUSBHub  <class AppleUSBHub, !registered, !matched, active, busy 0, retain count 4>
    | |   |   | +-o IOUSBInterface@0  <class IOUSBInterface, !registered, !matched, active, busy 0, retain count 5>
    | |   |   | +-o IOUSBUserClientInit  <class IOUSBUserClientInit, !registered, !matched, active, busy 0, retain count 4>
    | |   |   | +-o IOUSBDeviceUserClient  <class IOUSBDeviceUserClient, !registered, !matched, active, busy 0, retain count 5>
    | |   |   +-o IOUSBVendorSpecificDevice@18100000  <class IOUSBDevice, !registered, !matched, inactive, busy 4, retain count 9>
    | |   |     +-o MyDriver  <class MyDriver, !registered, !matched, inactive, busy 2, retain count 6>
    | |   |     | +-o IOSerialStreamSync  <class IOSerialStreamSync, !registered, !matched, inactive, busy 2, retain count 6>
    | |   |     |   +-o IOSerialBSDClient  <class IOSerialBSDClient, !registered, !matched, inactive, busy 1, retain count 5>

I have tried to call terminate() on the IOSerialStreamSync nub and on MyDriver when I get the kIOMessageServiceIsTerminated, but that does not have any effect.

Does anyone know what I am doing wrong?

Thanks,
Jessie
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