LAPB_S 155 net/lapb/lapb_subr.c if (!(skb->data[0] & LAPB_S)) { LAPB_S 191 net/lapb/lapb_subr.c if (!(skb->data[0] & LAPB_S)) { LAPB_S 254 net/lapb/lapb_subr.c if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */