diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 4391138e1b8a..46a0b586d234 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -378,7 +378,7 @@ static void async_mode(MGSLPC_INFO *info);
 static void tx_timeout(struct timer_list *t);
 
 static bool carrier_raised(struct tty_port *port);
-static void dtr_rts(struct tty_port *port, int onoff);
+static void dtr_rts(struct tty_port *port, bool onoff);
 
 #if SYNCLINK_GENERIC_HDLC
 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
@@ -2442,7 +2442,7 @@ static bool carrier_raised(struct tty_port *port)
 	return info->serial_signals & SerialSignal_DCD;
 }
 
-static void dtr_rts(struct tty_port *port, int onoff)
+static void dtr_rts(struct tty_port *port, bool onoff)
 {
 	MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
 	unsigned long flags;
diff --git a/drivers/mmc/core/sdio_uart.c b/drivers/mmc/core/sdio_uart.c
index 47f58258d8ff..c6b4b2b2a4b2 100644
--- a/drivers/mmc/core/sdio_uart.c
+++ b/drivers/mmc/core/sdio_uart.c
@@ -548,14 +548,14 @@ static bool uart_carrier_raised(struct tty_port *tport)
  *	adjusted during an open, close and hangup.
  */
 
-static void uart_dtr_rts(struct tty_port *tport, int onoff)
+static void uart_dtr_rts(struct tty_port *tport, bool onoff)
 {
 	struct sdio_uart_port *port =
 			container_of(tport, struct sdio_uart_port, port);
 	int ret = sdio_uart_claim_func(port);
 	if (ret)
 		return;
-	if (onoff == 0)
+	if (!onoff)
 		sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
 	else
 		sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index 90ff07f2cbf7..92d49740d5a4 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -701,7 +701,7 @@ static int gb_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
 	return -ENOIOCTLCMD;
 }
 
-static void gb_tty_dtr_rts(struct tty_port *port, int on)
+static void gb_tty_dtr_rts(struct tty_port *port, bool on)
 {
 	struct gb_tty *gb_tty;
 	u8 newctrl;
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 01c4fd3ce7c8..29d4c554f6b8 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1459,7 +1459,7 @@ static bool amiga_carrier_raised(struct tty_port *port)
 	return !(ciab.pra & SER_DCD);
 }
 
-static void amiga_dtr_rts(struct tty_port *port, int raise)
+static void amiga_dtr_rts(struct tty_port *port, bool raise)
 {
 	struct serial_state *info = container_of(port, struct serial_state,
 			tport);
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index a683e21df19c..10c10cfdf92a 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -376,7 +376,7 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
 		/* We are ready... raise DTR/RTS */
 		if (C_BAUD(tty))
 			if (hp->ops->dtr_rts)
-				hp->ops->dtr_rts(hp, 1);
+				hp->ops->dtr_rts(hp, true);
 		tty_port_set_initialized(&hp->port, true);
 	}
 
@@ -406,7 +406,7 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
 
 		if (C_HUPCL(tty))
 			if (hp->ops->dtr_rts)
-				hp->ops->dtr_rts(hp, 0);
+				hp->ops->dtr_rts(hp, false);
 
 		if (hp->ops->notifier_del)
 			hp->ops->notifier_del(hp, hp->data);
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
index 18d005814e4b..6d3428bf868f 100644
--- a/drivers/tty/hvc/hvc_console.h
+++ b/drivers/tty/hvc/hvc_console.h
@@ -66,7 +66,7 @@ struct hv_ops {
 	int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
 
 	/* Callbacks to handle tty ports */
-	void (*dtr_rts)(struct hvc_struct *hp, int raise);
+	void (*dtr_rts)(struct hvc_struct *hp, bool raise);
 };
 
 /* Register a vterm and a slot index for use as a console (console_init) */
diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index 7d49a872de48..fe862a6882d6 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -658,13 +658,13 @@ static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
 /**
  * hvc_iucv_dtr_rts() - HVC notifier for handling DTR/RTS
  * @hp:		Pointer the HVC device (struct hvc_struct)
- * @raise:	Non-zero to raise or zero to lower DTR/RTS lines
+ * @raise:	True to raise or false to lower DTR/RTS lines
  *
  * This routine notifies the HVC back-end to raise or lower DTR/RTS
  * lines.  Raising DTR/RTS is ignored.  Lowering DTR/RTS indicates to
  * drop the IUCV connection (similar to hang up the modem).
  */
-static void hvc_iucv_dtr_rts(struct hvc_struct *hp, int raise)
+static void hvc_iucv_dtr_rts(struct hvc_struct *hp, bool raise)
 {
 	struct hvc_iucv_private *priv;
 	struct iucv_path        *path;
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index 6a1e78e33a2c..98e180f3a4ec 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -502,15 +502,15 @@ static void moxa_poll(struct timer_list *);
 static void moxa_set_tty_param(struct tty_struct *, const struct ktermios *);
 static void moxa_shutdown(struct tty_port *);
 static bool moxa_carrier_raised(struct tty_port *);
-static void moxa_dtr_rts(struct tty_port *, int);
+static void moxa_dtr_rts(struct tty_port *, bool);
 /*
  * moxa board interface functions:
  */
 static void MoxaPortEnable(struct moxa_port *);
 static void MoxaPortDisable(struct moxa_port *);
 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
-static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
-static void MoxaPortLineCtrl(struct moxa_port *, int, int);
+static int MoxaPortGetLineOut(struct moxa_port *, bool *, bool *);
+static void MoxaPortLineCtrl(struct moxa_port *, bool, bool);
 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
 static int MoxaPortLineStatus(struct moxa_port *);
 static void MoxaPortFlushData(struct moxa_port *, int);
@@ -1443,7 +1443,7 @@ static bool moxa_carrier_raised(struct tty_port *port)
 	return dcd;
 }
 
-static void moxa_dtr_rts(struct tty_port *port, int onoff)
+static void moxa_dtr_rts(struct tty_port *port, bool onoff)
 {
 	struct moxa_port *ch = container_of(port, struct moxa_port, port);
 	MoxaPortLineCtrl(ch, onoff, onoff);
@@ -1481,7 +1481,7 @@ static int moxa_open(struct tty_struct *tty, struct file *filp)
 	if (!tty_port_initialized(&ch->port)) {
 		ch->statusflags = 0;
 		moxa_set_tty_param(tty, &tty->termios);
-		MoxaPortLineCtrl(ch, 1, 1);
+		MoxaPortLineCtrl(ch, true, true);
 		MoxaPortEnable(ch);
 		MoxaSetFifo(ch, ch->type == PORT_16550A);
 		tty_port_set_initialized(&ch->port, true);
@@ -1557,19 +1557,21 @@ static unsigned int moxa_chars_in_buffer(struct tty_struct *tty)
 static int moxa_tiocmget(struct tty_struct *tty)
 {
 	struct moxa_port *ch = tty->driver_data;
-	int flag = 0, dtr, rts;
+	bool dtr, rts;
+	int flag = 0;
+	int status;
 
 	MoxaPortGetLineOut(ch, &dtr, &rts);
 	if (dtr)
 		flag |= TIOCM_DTR;
 	if (rts)
 		flag |= TIOCM_RTS;
-	dtr = MoxaPortLineStatus(ch);
-	if (dtr & 1)
+	status = MoxaPortLineStatus(ch);
+	if (status & 1)
 		flag |= TIOCM_CTS;
-	if (dtr & 2)
+	if (status & 2)
 		flag |= TIOCM_DSR;
-	if (dtr & 4)
+	if (status & 4)
 		flag |= TIOCM_CD;
 	return flag;
 }
@@ -1578,7 +1580,7 @@ static int moxa_tiocmset(struct tty_struct *tty,
 			 unsigned int set, unsigned int clear)
 {
 	struct moxa_port *ch;
-	int dtr, rts;
+	bool dtr, rts;
 
 	mutex_lock(&moxa_openlock);
 	ch = tty->driver_data;
@@ -1589,13 +1591,13 @@ static int moxa_tiocmset(struct tty_struct *tty,
 
 	MoxaPortGetLineOut(ch, &dtr, &rts);
 	if (set & TIOCM_RTS)
-		rts = 1;
+		rts = true;
 	if (set & TIOCM_DTR)
-		dtr = 1;
+		dtr = true;
 	if (clear & TIOCM_RTS)
-		rts = 0;
+		rts = false;
 	if (clear & TIOCM_DTR)
-		dtr = 0;
+		dtr = false;
 	MoxaPortLineCtrl(ch, dtr, rts);
 	mutex_unlock(&moxa_openlock);
 	return 0;
@@ -1879,10 +1881,10 @@ static void MoxaPortFlushData(struct moxa_port *port, int mode)
  *      Syntax:
  *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
  *           int port           : port number (0 - 127)
- *           int * dtrState     : pointer to INT to receive the current DTR
+ *           bool * dtrState    : pointer to bool to receive the current DTR
  *                                state. (if NULL, this function will not
  *                                write to this address)
- *           int * rtsState     : pointer to INT to receive the current RTS
+ *           bool * rtsState    : pointer to bool to receive the current RTS
  *                                state. (if NULL, this function will not
  *                                write to this address)
  *
@@ -1892,10 +1894,10 @@ static void MoxaPortFlushData(struct moxa_port *port, int mode)
  *
  *      Function 14:    Setting the DTR/RTS output state of this port.
  *      Syntax:
- *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
+ *      void MoxaPortLineCtrl(int port, bool dtrState, bool rtsState);
  *           int port           : port number (0 - 127)
- *           int dtrState       : DTR output state (0: off, 1: on)
- *           int rtsState       : RTS output state (0: off, 1: on)
+ *           bool dtrState      : DTR output state (0: off, 1: on)
+ *           bool rtsState      : RTS output state (0: off, 1: on)
  *
  *
  *      Function 15:    Setting the flow control of this port.
@@ -2103,18 +2105,18 @@ static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
 	return baud;
 }
 
-static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
-		int *rtsState)
+static int MoxaPortGetLineOut(struct moxa_port *port, bool *dtrState,
+		bool *rtsState)
 {
 	if (dtrState)
-		*dtrState = !!(port->lineCtrl & DTR_ON);
+		*dtrState = port->lineCtrl & DTR_ON;
 	if (rtsState)
-		*rtsState = !!(port->lineCtrl & RTS_ON);
+		*rtsState = port->lineCtrl & RTS_ON;
 
 	return 0;
 }
 
-static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
+static void MoxaPortLineCtrl(struct moxa_port *port, bool dtr, bool rts)
 {
 	u8 mode = 0;
 
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 96c72e691cd7..d4fb11e39bb1 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -465,7 +465,7 @@ static bool mxser_carrier_raised(struct tty_port *port)
 	return inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD;
 }
 
-static void mxser_dtr_rts(struct tty_port *port, int on)
+static void mxser_dtr_rts(struct tty_port *port, bool on)
 {
 	struct mxser_port *mp = container_of(port, struct mxser_port, port);
 	unsigned long flags;
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 81fc2ec3693f..8dd0d6441c42 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3792,7 +3792,7 @@ static bool gsm_carrier_raised(struct tty_port *port)
 	return dlci->modem_rx & TIOCM_CD;
 }
 
-static void gsm_dtr_rts(struct tty_port *port, int onoff)
+static void gsm_dtr_rts(struct tty_port *port, bool onoff)
 {
 	struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
 	unsigned int modem_tx = dlci->modem_tx;
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 20ed8a088b2d..053535846ba2 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -169,7 +169,7 @@ uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
 #define uart_set_mctrl(port, set)	uart_update_mctrl(port, set, 0)
 #define uart_clear_mctrl(port, clear)	uart_update_mctrl(port, 0, clear)
 
-static void uart_port_dtr_rts(struct uart_port *uport, int raise)
+static void uart_port_dtr_rts(struct uart_port *uport, bool raise)
 {
 	if (raise)
 		uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
@@ -239,7 +239,7 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
 		 * port is open and ready to respond.
 		 */
 		if (init_hw && C_BAUD(tty))
-			uart_port_dtr_rts(uport, 1);
+			uart_port_dtr_rts(uport, true);
 	}
 
 	/*
@@ -302,7 +302,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 		}
 
 		if (!tty || C_HUPCL(tty))
-			uart_port_dtr_rts(uport, 0);
+			uart_port_dtr_rts(uport, false);
 
 		uart_port_shutdown(port);
 	}
@@ -1885,7 +1885,7 @@ static bool uart_carrier_raised(struct tty_port *port)
 	return mctrl & TIOCM_CAR;
 }
 
-static void uart_dtr_rts(struct tty_port *port, int raise)
+static void uart_dtr_rts(struct tty_port *port, bool raise)
 {
 	struct uart_state *state = container_of(port, struct uart_state, port);
 	struct uart_port *uport;
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 4ba71ec764f7..2b786265ce7b 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -3138,7 +3138,7 @@ static bool carrier_raised(struct tty_port *port)
 	return info->signals & SerialSignal_DCD;
 }
 
-static void dtr_rts(struct tty_port *port, int on)
+static void dtr_rts(struct tty_port *port, bool on)
 {
 	unsigned long flags;
 	struct slgt_info *info = container_of(port, struct slgt_info, port);
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index a573c500f95b..a788a6bf487d 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -463,7 +463,7 @@ EXPORT_SYMBOL(tty_port_carrier_raised);
 void tty_port_raise_dtr_rts(struct tty_port *port)
 {
 	if (port->ops->dtr_rts)
-		port->ops->dtr_rts(port, 1);
+		port->ops->dtr_rts(port, true);
 }
 EXPORT_SYMBOL(tty_port_raise_dtr_rts);
 
@@ -478,7 +478,7 @@ EXPORT_SYMBOL(tty_port_raise_dtr_rts);
 void tty_port_lower_dtr_rts(struct tty_port *port)
 {
 	if (port->ops->dtr_rts)
-		port->ops->dtr_rts(port, 0);
+		port->ops->dtr_rts(port, false);
 }
 EXPORT_SYMBOL(tty_port_lower_dtr_rts);
 
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 36bf051b345b..d4f9220b8162 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -651,7 +651,7 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 	return tty_port_open(&acm->port, tty, filp);
 }
 
-static void acm_port_dtr_rts(struct tty_port *port, int raise)
+static void acm_port_dtr_rts(struct tty_port *port, bool raise)
 {
 	struct acm *acm = container_of(port, struct acm, port);
 	int val;
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 792f01a4ed22..98ec4fe46914 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -420,7 +420,7 @@ static bool ch341_carrier_raised(struct usb_serial_port *port)
 	return priv->msr & CH341_BIT_DCD;
 }
 
-static void ch341_dtr_rts(struct usb_serial_port *port, int on)
+static void ch341_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct ch341_private *priv = usb_get_serial_port_data(port);
 	unsigned long flags;
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 67372acc2352..fe2cdc477fb9 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -45,7 +45,7 @@ static void cp210x_disconnect(struct usb_serial *);
 static void cp210x_release(struct usb_serial *);
 static int cp210x_port_probe(struct usb_serial_port *);
 static void cp210x_port_remove(struct usb_serial_port *);
-static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
+static void cp210x_dtr_rts(struct usb_serial_port *port, bool on);
 static void cp210x_process_read_urb(struct urb *urb);
 static void cp210x_enable_event_mode(struct usb_serial_port *port);
 static void cp210x_disable_event_mode(struct usb_serial_port *port);
@@ -1402,7 +1402,7 @@ static int cp210x_tiocmset_port(struct usb_serial_port *port,
 	return ret;
 }
 
-static void cp210x_dtr_rts(struct usb_serial_port *port, int on)
+static void cp210x_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	if (on)
 		cp210x_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 1e0c028c5ec9..7c6060c17ee0 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -118,7 +118,7 @@ static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 static void cypress_port_remove(struct usb_serial_port *port);
 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void cypress_close(struct usb_serial_port *port);
-static void cypress_dtr_rts(struct usb_serial_port *port, int on);
+static void cypress_dtr_rts(struct usb_serial_port *port, bool on);
 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 			const unsigned char *buf, int count);
 static void cypress_send(struct usb_serial_port *port);
@@ -621,12 +621,12 @@ static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 	return result;
 } /* cypress_open */
 
-static void cypress_dtr_rts(struct usb_serial_port *port, int on)
+static void cypress_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct cypress_private *priv = usb_get_serial_port_data(port);
 	/* drop dtr and rts */
 	spin_lock_irq(&priv->lock);
-	if (on == 0)
+	if (!on)
 		priv->line_control = 0;
 	else 
 		priv->line_control = CONTROL_DTR | CONTROL_RTS;
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 45d688e9b93f..890e446273d7 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -228,7 +228,7 @@ static unsigned int digi_write_room(struct tty_struct *tty);
 static unsigned int digi_chars_in_buffer(struct tty_struct *tty);
 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void digi_close(struct usb_serial_port *port);
-static void digi_dtr_rts(struct usb_serial_port *port, int on);
+static void digi_dtr_rts(struct usb_serial_port *port, bool on);
 static int digi_startup_device(struct usb_serial *serial);
 static int digi_startup(struct usb_serial *serial);
 static void digi_disconnect(struct usb_serial *serial);
@@ -1060,10 +1060,10 @@ static unsigned int digi_chars_in_buffer(struct tty_struct *tty)
 	return chars;
 }
 
-static void digi_dtr_rts(struct usb_serial_port *port, int on)
+static void digi_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	/* Adjust DTR and RTS */
-	digi_set_modem_signals(port, on * (TIOCM_DTR | TIOCM_RTS), 1);
+	digi_set_modem_signals(port, on ? (TIOCM_DTR | TIOCM_RTS) : 0, 1);
 }
 
 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 1a8c2925c26f..1656be847460 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -752,7 +752,7 @@ static void f81232_close(struct usb_serial_port *port)
 	flush_work(&port_priv->lsr_work);
 }
 
-static void f81232_dtr_rts(struct usb_serial_port *port, int on)
+static void f81232_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	if (on)
 		f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 4083ae961be4..8b44b08752d6 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -1456,7 +1456,7 @@ static int f81534_tiocmset(struct tty_struct *tty, unsigned int set,
 	return f81534_update_mctrl(port, set, clear);
 }
 
-static void f81534_dtr_rts(struct usb_serial_port *port, int on)
+static void f81534_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	if (on)
 		f81534_update_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 05e28a5ce42b..09bdf623e94e 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2366,7 +2366,7 @@ static int ftdi_open(struct tty_struct *tty, struct usb_serial_port *port)
 	return usb_serial_generic_open(tty, port);
 }
 
-static void ftdi_dtr_rts(struct usb_serial_port *port, int on)
+static void ftdi_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
 
diff --git a/drivers/usb/serial/ipw.c b/drivers/usb/serial/ipw.c
index d04c7cc5c1c2..b1b7a033cc75 100644
--- a/drivers/usb/serial/ipw.c
+++ b/drivers/usb/serial/ipw.c
@@ -215,7 +215,7 @@ static void ipw_release(struct usb_serial *serial)
 	kfree(data);
 }
 
-static void ipw_dtr_rts(struct usb_serial_port *port, int on)
+static void ipw_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct usb_device *udev = port->serial->dev;
 	struct device *dev = &port->dev;
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index 2966e0c4941e..7e375367354b 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -1564,7 +1564,7 @@ static int keyspan_open(struct tty_struct *tty, struct usb_serial_port *port)
 	return 0;
 }
 
-static void keyspan_dtr_rts(struct usb_serial_port *port, int on)
+static void keyspan_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct keyspan_port_private *p_priv = usb_get_serial_port_data(port);
 
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index 6fd15cd9e1eb..cb16c4bc8555 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -551,7 +551,7 @@ static int keyspan_pda_write(struct tty_struct *tty, struct usb_serial_port *por
 	return count;
 }
 
-static void keyspan_pda_dtr_rts(struct usb_serial_port *port, int on)
+static void keyspan_pda_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct usb_serial *serial = port->serial;
 
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index d3852feb81a4..eb3520490dd2 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -42,7 +42,7 @@ static int  mct_u232_port_probe(struct usb_serial_port *port);
 static void mct_u232_port_remove(struct usb_serial_port *remove);
 static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void mct_u232_close(struct usb_serial_port *port);
-static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
+static void mct_u232_dtr_rts(struct usb_serial_port *port, bool on);
 static void mct_u232_read_int_callback(struct urb *urb);
 static void mct_u232_set_termios(struct tty_struct *tty,
 				 struct usb_serial_port *port,
@@ -477,7 +477,7 @@ static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)
 	return retval;
 } /* mct_u232_open */
 
-static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
+static void mct_u232_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	unsigned int control_state;
 	struct mct_u232_private *priv = usb_get_serial_port_data(port);
diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
index faa0eedfe245..ac7594635719 100644
--- a/drivers/usb/serial/mxuport.c
+++ b/drivers/usb/serial/mxuport.c
@@ -674,7 +674,7 @@ static int mxuport_set_rts(struct usb_serial_port *port, u8 state)
 	return err;
 }
 
-static void mxuport_dtr_rts(struct usb_serial_port *port, int on)
+static void mxuport_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
 	u8 mcr_state;
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 4cb81746a149..cb20911f35bb 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -931,7 +931,7 @@ static void pl2303_set_termios(struct tty_struct *tty,
 	kfree(buf);
 }
 
-static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
+static void pl2303_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
 	unsigned long flags;
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 6fca40ace83a..6fd329ffec7e 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -770,7 +770,7 @@ static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 
 
 
-static void qt2_dtr_rts(struct usb_serial_port *port, int on)
+static void qt2_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct usb_device *dev = port->serial->dev;
 	struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 353b2549eaa8..f2c3a7af1a4a 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -813,7 +813,7 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
 }
 
 
-static void sierra_dtr_rts(struct usb_serial_port *port, int on)
+static void sierra_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct sierra_port_private *portdata;
 
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index 8175db6c4554..02402ea3bd1b 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -256,7 +256,7 @@ static bool spcp8x5_carrier_raised(struct usb_serial_port *port)
 	return ret || msr & MSR_STATUS_LINE_DCD;
 }
 
-static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
+static void spcp8x5_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct spcp8x5_private *priv = usb_get_serial_port_data(port);
 	unsigned long flags;
diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c
index 1e1888b66305..4cff39895804 100644
--- a/drivers/usb/serial/ssu100.c
+++ b/drivers/usb/serial/ssu100.c
@@ -385,7 +385,7 @@ static int ssu100_tiocmset(struct tty_struct *tty,
 	return update_mctrl(dev, set, clear);
 }
 
-static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
+static void ssu100_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct usb_device *dev = port->serial->dev;
 
diff --git a/drivers/usb/serial/upd78f0730.c b/drivers/usb/serial/upd78f0730.c
index c47439bd90fa..206749fe3263 100644
--- a/drivers/usb/serial/upd78f0730.c
+++ b/drivers/usb/serial/upd78f0730.c
@@ -262,7 +262,7 @@ static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
 	mutex_unlock(&private->lock);
 }
 
-static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on)
+static void upd78f0730_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct tty_struct *tty = port->port.tty;
 	unsigned int set = 0;
@@ -307,9 +307,9 @@ static void upd78f0730_set_termios(struct tty_struct *tty,
 		return;
 
 	if (C_BAUD(tty) == B0)
-		upd78f0730_dtr_rts(port, 0);
+		upd78f0730_dtr_rts(port, false);
 	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
-		upd78f0730_dtr_rts(port, 1);
+		upd78f0730_dtr_rts(port, true);
 
 	baud_rate = upd78f0730_get_baud_rate(tty);
 	request.opcode = UPD78F0730_CMD_LINE_CONTROL;
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 019720a63fac..f8404073558b 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -765,7 +765,7 @@ static bool serial_port_carrier_raised(struct tty_port *port)
 	return true;
 }
 
-static void serial_port_dtr_rts(struct tty_port *port, int on)
+static void serial_port_dtr_rts(struct tty_port *port, bool on)
 {
 	struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 	struct usb_serial_driver *drv = p->serial->type;
diff --git a/drivers/usb/serial/usb-wwan.h b/drivers/usb/serial/usb-wwan.h
index 519101945769..b2a07dd44225 100644
--- a/drivers/usb/serial/usb-wwan.h
+++ b/drivers/usb/serial/usb-wwan.h
@@ -6,7 +6,7 @@
 #ifndef __LINUX_USB_USB_WWAN
 #define __LINUX_USB_USB_WWAN
 
-extern void usb_wwan_dtr_rts(struct usb_serial_port *port, int on);
+extern void usb_wwan_dtr_rts(struct usb_serial_port *port, bool on);
 extern int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port);
 extern void usb_wwan_close(struct usb_serial_port *port);
 extern int usb_wwan_port_probe(struct usb_serial_port *port);
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 0017f6e969e1..168b11cc02b6 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -69,7 +69,7 @@ static int usb_wwan_send_setup(struct usb_serial_port *port)
 	return res;
 }
 
-void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
+void usb_wwan_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	struct usb_wwan_port_private *portdata;
 	struct usb_wwan_intf_private *intfdata;
diff --git a/drivers/usb/serial/xr_serial.c b/drivers/usb/serial/xr_serial.c
index fdb0aae546c3..9aaed09d45e4 100644
--- a/drivers/usb/serial/xr_serial.c
+++ b/drivers/usb/serial/xr_serial.c
@@ -495,7 +495,7 @@ static int xr_tiocmset(struct tty_struct *tty,
 	return xr_tiocmset_port(port, set, clear);
 }
 
-static void xr_dtr_rts(struct usb_serial_port *port, int on)
+static void xr_dtr_rts(struct usb_serial_port *port, bool on)
 {
 	if (on)
 		xr_tiocmset_port(port, TIOCM_DTR | TIOCM_RTS, 0);
@@ -669,9 +669,9 @@ static void xr_set_flow_mode(struct tty_struct *tty,
 	xr_uart_enable(port);
 
 	if (C_BAUD(tty) == B0)
-		xr_dtr_rts(port, 0);
+		xr_dtr_rts(port, false);
 	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
-		xr_dtr_rts(port, 1);
+		xr_dtr_rts(port, true);
 }
 
 static void xr21v141x_set_line_settings(struct tty_struct *tty,
diff --git a/include/linux/tty_port.h b/include/linux/tty_port.h
index cf098459cb01..c44e489de0ff 100644
--- a/include/linux/tty_port.h
+++ b/include/linux/tty_port.h
@@ -16,7 +16,7 @@ struct tty_struct;
 /**
  * struct tty_port_operations -- operations on tty_port
  * @carrier_raised: return true if the carrier is raised on @port
- * @dtr_rts: raise the DTR line if @raise is nonzero, otherwise lower DTR
+ * @dtr_rts: raise the DTR line if @raise is true, otherwise lower DTR
  * @shutdown: called when the last close completes or a hangup finishes IFF the
  *	port was initialized. Do not use to free resources. Turn off the device
  *	only. Called under the port mutex to serialize against @activate and
@@ -32,7 +32,7 @@ struct tty_struct;
  */
 struct tty_port_operations {
 	bool (*carrier_raised)(struct tty_port *port);
-	void (*dtr_rts)(struct tty_port *port, int raise);
+	void (*dtr_rts)(struct tty_port *port, bool raise);
 	void (*shutdown)(struct tty_port *port);
 	int (*activate)(struct tty_port *port, struct tty_struct *tty);
 	void (*destruct)(struct tty_port *port);
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index dc7f90522b42..c597357853d9 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -292,7 +292,7 @@ struct usb_serial_driver {
 			struct serial_icounter_struct *icount);
 	/* Called by the tty layer for port level work. There may or may not
 	   be an attached tty at this point */
-	void (*dtr_rts)(struct usb_serial_port *port, int on);
+	void (*dtr_rts)(struct usb_serial_port *port, bool on);
 	bool (*carrier_raised)(struct usb_serial_port *port);
 	/* Called by the usb serial hooks to allow the user to rework the
 	   termios state */
