SHDLC_CONTROL_HEAD_U 170 net/nfc/hci/llc_shdlc.c *(u8 *)skb_push(skb, 1) = SHDLC_CONTROL_HEAD_U | uframe_modifier; SHDLC_CONTROL_HEAD_U 493 net/nfc/hci/llc_shdlc.c case SHDLC_CONTROL_HEAD_U: