815             if tty.core().link().is_some() {  in input_signal()
1530         let link = tty.link().unwrap();  in packet_mode_flush()  localVariable
1531         if link.core().contorl_info_irqsave().packet {  in packet_mode_flush()
1536             link.core().read_wq().wakeup_all();  in packet_mode_flush()
1570         if core.link().is_some() {  in flush_buffer()
1647                 let link = core.link().unwrap();  in read()  localVariable
1648                 let link = link.core();  in read()  localVariable
1649                 let mut ctrl = link.contorl_info_irqsave();  in read()
2068             let link = core.link();  in poll()  localVariable
2069             if link.is_some()  in poll()
2070                 && !link  in poll()