XHCI: Question regarding process_ctrl_td()

[hemantk]

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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