>     > It seems that the PL2303 driver doesn't implement TIOCGICOUNT
>     > /usr/src/linux/usb/serial/pl2303.c
>
>     Well, no, this ioctl gets handled by the tty-layer. Yes, the driver
>     needs to define a get_icount-routine which it lacks.
>
> I think this is introduced in kernel 2.6.37 (not yet released)

So, its commit-id would be? ;) (And I can't see anything even in
linux-next...) Anyway, this driver-talk became offtopic for this list.

Regards,

  Wolfram