serial: remove quot_frac from serial8250_do_set_divisor()

quot_frac is unused in serial8250_do_set_divisor() since commit
b2b4b8ed3c06 (serial: 8250_exar: Move custom divisor support out from
8250_port). So no point to pass it.

Signed-off-by: Jiri Slaby (SUSE) <[e-mail]>
Cc: Ilpo Järvinen <[e-mail]>
Cc: Andy Shevchenko <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/8250/8250_dwlib.c

···
 			       unsigned int quot, unsigned int quot_frac)
 {
 	dw8250_writel_ext(p, DW_UART_DLF, quot_frac);
-	serial8250_do_set_divisor(p, baud, quot, quot_frac);
+	serial8250_do_set_divisor(p, baud, quot);
 }
 
 void dw8250_do_set_termios(struct uart_port *p, struct ktermios *termios,

drivers/tty/serial/8250/8250_exar.c

···
 static void xr17v35x_set_divisor(struct uart_port *p, unsigned int baud,
 				 unsigned int quot, unsigned int quot_frac)
 {
-	serial8250_do_set_divisor(p, baud, quot, quot_frac);
+	serial8250_do_set_divisor(p, baud, quot);
 
 	/* Preserve bits not related to baudrate; DLD[7:4]. */
 	quot_frac |= serial_port_in(p, 0x2) & 0xf0;

drivers/tty/serial/8250/8250_pci.c

···
 	serial_icr_write(up, UART_TCR, tcr);
 	serial_icr_write(up, UART_CPR, cpr);
 	serial_icr_write(up, UART_CKS, cpr2);
-	serial8250_do_set_divisor(port, baud, quot, 0);
+	serial8250_do_set_divisor(port, baud, quot);
 }
 
 /*

drivers/tty/serial/8250/8250_port.c

···
 }
 
 void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
-			       unsigned int quot, unsigned int quot_frac)
+			       unsigned int quot)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 
···
 	if (port->set_divisor)
 		port->set_divisor(port, baud, quot, quot_frac);
 	else
-		serial8250_do_set_divisor(port, baud, quot, quot_frac);
+		serial8250_do_set_divisor(port, baud, quot);
 }
 
 static unsigned int serial8250_get_baud_rate(struct uart_port *port,

include/linux/serial_8250.h

···
 		      unsigned int oldstate);
 void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
-			       unsigned int quot, unsigned int quot_frac);
+			       unsigned int quot);
 int fsl8250_handle_irq(struct uart_port *port);
 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 u16 serial8250_rx_chars(struct uart_8250_port *up, u16 lsr);