static int ohci_service_ed_list(OHCIState *ohci, uint32_t head, int completion) { struct ohci_ed ed; uint32_t next_ed; uint32_t cur; int active; active = 0; if (head == 0) return 0; for (cur = head; cur; cur = next_ed) { if (ohci_read_ed(ohci, cur, &ed)) { trace_usb_ohci_ed_read_error(cur); ohci_die(ohci); return 0; } next_ed = ed.next & OHCI_DPTR_MASK; if ((ed.head & OHCI_ED_H) || (ed.flags & OHCI_ED_K)) { uint32_t addr; /* Cancel pending packets for ED that have been paused. */ addr = ed.head & OHCI_DPTR_MASK; if (ohci->async_td && addr == ohci->async_td) { usb_cancel_packet(&ohci->usb_packet); ohci->async_td = 0; usb_device_ep_stopped(ohci->usb_packet.ep->dev, ohci->usb_packet.ep); } continue; } while ((ed.head & OHCI_DPTR_MASK) != ed.tail) { trace_usb_ohci_ed_pkt(cur, (ed.head & OHCI_ED_H) != 0, (ed.head & OHCI_ED_C) != 0, ed.head & OHCI_DPTR_MASK, ed.tail & OHCI_DPTR_MASK, ed.next & OHCI_DPTR_MASK); trace_usb_ohci_ed_pkt_flags( OHCI_BM(ed.flags, ED_FA), OHCI_BM(ed.flags, ED_EN), OHCI_BM(ed.flags, ED_D), (ed.flags & OHCI_ED_S)!= 0, (ed.flags & OHCI_ED_K) != 0, (ed.flags & OHCI_ED_F) != 0, OHCI_BM(ed.flags, ED_MPS)); active = 1; if ((ed.flags & OHCI_ED_F) == 0) { if (ohci_service_td(ohci, &ed)) break; } else { /* Handle isochronous endpoints */ if (ohci_service_iso_td(ohci, &ed, completion)) break; } } if (ohci_put_ed(ohci, cur, &ed)) { ohci_die(ohci); return 0; } } return active; }