BUGS
    * A kernel panic is still there...
    * It happens that the modem stalls and still says OK to the driver. Don't
    know when and why this happens, neither how to fix this. Grrr.
    * The modem seems to stall if its firmware is not loaded within an unknown
    time-out after plug in if it is connected to the telephone line. This seems
    to be a severe bug of the factory default firmware, since the modem doesn't
    answer on any control URB anymore after that. The only solution seems to
    unplug it and plug it again. I check other device drivers that loads firmware
    to EzUSB chips, they do exactly the same code and do not seem to have any
    time-out problem on the Reset message. Grrr.
