On Fr, Sep 08, 2006 at 02:09:58 -0700, Greg KH wrote:
> Is it really needed for the "Horrible hack"? I didn't think they were
> making chips anymore that needed it.
Without "Horrible hack" _two_ ttyUSBx are created of which only the
second one is working. For Stephen's device the second ttyUSBx was
usable. My device generated a segfault when submitting the interrupt
urb near the end of pl2303_open. To avoid the segfault I had to guard
the urb by
if (port->interrupt_in_urb) {
[...]
} else {
dbg("%s - interrupt_in_urb is empty!", __FUNCTION__);
}
which is also used in cypress_m8. With "Horrible hack" only one ttyUSB
is created and the interrupt urb is not empty.
So yes, the "Horrible hack" is really needed for this device.
BTW another hint may or may not be: cdc-acm warns "The
data interface has switched endpoints" (as long as device is not
blacklisted in hid-core).
Regards
Johannes
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