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Polling for the data-transfer window to become open is wasteful. We can eliminate the polling loop by using hw_step() as the handler for an xfer_window_changed() event. If the window is already open at the time of instantiation, then xfer_window_changed() may never be called. We can cover this case by using hw_step() as the step() method of a one-shot process. Since the signature for an xfer_window_changed() method is identical to the signature for a process step() method, the same function can be used for both. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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