Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes"causes gobi_loader to hang

[Alan Stern]

On Mon, 22 Feb 2010, Anssi Hannula wrote:

> I guess that would suggest that the device doesn't allow the initialization 
> data to be broken into packets arbitrarily (though some differences seem 
> allowed, as the windows driver transmits them differently).
> 
> Does this mean a tty interface is ill-suited for the microcode upload, and 
> instead qcserial should use the kernel's generic microcode upload mechanism or 
> the userspace should use libusb to do it?

I don't know.  Didn't the old successful code use a tty interface?

> Any idea what could be causing the hang, then?

No idea, unless it's the device.

>  The WARNING that appears when 
> interrupting the hung gobi_loader is for serial_unthrottle() being called 
> while usb_serial_port->port.count == 0.

That's a bogus warning.  It will be removed in an upcoming kernel 
version.

Alan Stern

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/