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



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