XHCI: Question regarding process_ctrl_td()

[hemantk@xxxxxxxxxxxxxx]

Hi

I have question regarding code snippet in process_ctrl_td()

		if (event_trb == td->last_trb) {
			if (td->urb->actual_length != 0) {
				/* Don't overwrite a previously set error code
				 */
				if ((*status == -EINPROGRESS || *status == 0) &&
						(td->urb->transfer_flags
						 & URB_SHORT_NOT_OK))
					/* Did we already see a short data
					 * stage? */
					*status = -EREMOTEIO;
			} else {
			>>>>	td->urb->actual_length =
					td->urb->transfer_buffer_length;
			}
}


For status stage of a control transfer what is the reason for overwriting
the actual_length with transfer_buffer_length in case if actual_length is
zero(highlighted with >>>>)?


Thanks,
Hemant



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