+/*
+ * Used to take back a TD from the host controller. This would normally be
+ * called from within dl_done_list, however it may be called directly if the
+ * HC no longer sees the TD and it has not appeared on the donelist (after
+ * two frames). This bug has been observed on ZF Micro systems.
+ */
+static void takeback_td(struct ohci_hcd *ohci, struct td *td)
+{
+ struct urb *urb = td->urb;
+ urb_priv_t *urb_priv = urb->hcpriv;
+ struct ed *ed = td->ed;
+ int status;
+
+ /* update URB's length and status from TD */
+ status = td_done(ohci, urb, td);
+ urb_priv->td_cnt++;
+
+ /* If all this urb's TDs are done, call complete() */
+ if (urb_priv->td_cnt == urb_priv->length)
+ finish_urb(ohci, urb, status);
+
+ /* clean schedule: unlink EDs that are no longer busy */
+ if (list_empty(&ed->td_list)) {
+ if (ed->state == ED_OPER)
+ start_ed_unlink(ohci, ed);
+
+ /* ... reenabling halted EDs only after fault cleanup */
+ } else if ((ed->hwINFO & cpu_to_hc32(ohci, ED_SKIP | ED_DEQUEUE))
+ == cpu_to_hc32(ohci, ED_SKIP)) {
+ td = list_entry(ed->td_list.next, struct td, td_list);
+ if (!(td->hwINFO & cpu_to_hc32(ohci, TD_DONE))) {
+ ed->hwINFO &= ~cpu_to_hc32(ohci, ED_SKIP);
+ /* ... hc may need waking-up */
+ switch (ed->type) {
+ case PIPE_CONTROL:
+ ohci_writel(ohci, OHCI_CLF,
+ &ohci->regs->cmdstatus);
+ break;
+ case PIPE_BULK:
+ ohci_writel(ohci, OHCI_BLF,
+ &ohci->regs->cmdstatus);
+ break;
+ }
+ }
+ }
+}
+