I'm just trying our application out on Tiger and have noticed a
disturbing behavior. I'm wondering if anyone can give me a hint.
Our application interfaces with some hardware, which it communicates
with via BSD serial commands. The device uses an FDTI USB chip and
FTDI supplies a kernel driver that exposes the device as a serial port.
We do hot-plug detection for this device. When we notice the device
has arrived, we use typical BSD type commands to open up the serial
port and communicate with the device. When we get a notification that
the device is gone, we clean things up and notify the user.
The problem appears to be that once the serial port is opened,
unplugging the device freezes the USB subsystem. (i.e. if I don't
open the serial port, unplugging doesn't hang the USB). The machine
still runs (i.e. eventually the screensaver will start), but the
mouse and keyboard and other USB devices are dead. I never get my
interest notification callback telling me about the unplug. This is
on a dual processor 2.0 GHz G5 desktop system.
I'm wondering where I should point the finger here. Is this a problem
with Tiger's USB system, or the FTDI driver, or with my code somehow?
Thanks,
Brent Marykuca
Art & Logic
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