On Wed, Jan 08, 2003 at 09:32:07PM +0100, Henning Meier-Geinitz wrote:
>
> Anyone any ideas? Just crappy hardware? But why is the error triggered
> by a simple function like resetep?
It might be a data toggle problem. I've seen this in the past on 2.4
and 2.5 (haven't tested for it in a while on either one though.) I got
around it with the code in drivers/usb/serial/io_ti.c::edge_open() tha
looks like:
/*
* reset the data toggle on the bulk endpoints to work around bug in
* host controllers where things get out of sync some times
*/
usb_clear_halt (dev, port->write_urb->pipe);
usb_clear_halt (dev, port->read_urb->pipe);
It can be a combination of a bug in the device itself with the data
toggle too that might cause it, I've heard of that happening. I know
the keyspan driver goes to great lengths to keep track of this due to
this problem.
As to how to fix this, I don't know, try inserting something like the
above somewhere in devio.c when an open happens to see if that helps.
Good luck,
greg k-h
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