On Wed, 13 Feb 2008 13:31:54 -0600, Andrew McKay <[EMAIL PROTECTED]> wrote:
> spin_lock_bh(&port->lock);
> if (port->write_urb_busy) {
If you lock against callbacks and do not trigger tasklets yourself,
you must use spin_lock_irqsave (or spin_lock_irq if you are belong
to Oliver's denomination).
> This leads me to my question. Is there a buffer that the control URB ends up
> sitting in that doesn't get flushed until a certain number of bytes are sent
> to
> the USB end point? If this is the case, is there an accepted method of
> fushing
> the URB to the USB endpoint?
Don't overthink it.
Look at the traffic with usbmon, it provides you timestamps for
(S)ubmission and (C)allback events.
-- Pete
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