ohci_soft_td
LIST_HEAD(, ohci_soft_td) sc_hash_tds[OHCI_HASH_SIZE];
struct ohci_soft_td *nexttd; /* mirrors nexttd in TD */
struct ohci_soft_td *dnext; /* next in done list */
struct ohci_soft_td **held; /* where the ref to this std is held */
LIST_ENTRY(ohci_soft_td) hnext; /* next on hash list */