Symbol: serial8250_tx_dma_running
drivers/tty/serial/8250/8250_dw.c
175
if (serial8250_tx_dma_running(up))
drivers/tty/serial/8250/8250_port.c
1887
if (!serial8250_tx_dma_running(up) && uart_lsr_tx_empty(serial_lsr_in(up)))