serial8250_tx_dma  303 drivers/tty/serial/8250/8250.h extern int serial8250_tx_dma(struct uart_8250_port *);
serial8250_tx_dma   36 drivers/tty/serial/8250/8250_dma.c 	ret = serial8250_tx_dma(p);
serial8250_tx_dma 3101 drivers/tty/serial/8250/8250_port.c 			up->dma->tx_dma = serial8250_tx_dma;