[PATCH v3 06/13] tty: Convert ->carrier_raised() and callchains to bool

* [PATCH v3 06/13] tty: Convert ->carrier_raised() and callchains to bool
       [not found] <20230111142331.34518-1-ilpo.jarvinen@linux.intel.com>
@ 2023-01-11 14:23 ` Ilpo Järvinen
  2023-01-11 17:25   ` Johan Hovold
  2023-01-13 11:50   ` Ulf Hansson
  0 siblings, 2 replies; 3+ messages in thread
From: Ilpo Järvinen @ 2023-01-11 14:23 UTC (permalink / raw)
  To: linux-serial, Greg Kroah-Hartman, Jiri Slaby, Johan Hovold,
	Samuel Iglesias Gonsálvez, Rodolfo Giometti, Arnd Bergmann,
	Ulf Hansson, Shawn Guo, Sascha Hauer, Pengutronix Kernel Team,
	Fabio Estevam, NXP Linux Team, Marcel Holtmann, Johan Hedberg,
	Luiz Augusto von Dentz, David S. Miller, Eric Dumazet,
	Jakub Kicinski, Paolo Abeni, linux-kernel, linux-mmc,
	linux-arm-kernel, linux-usb, linux-bluetooth, netdev
  Cc: Ilpo Järvinen

Return boolean from ->carrier_raised() instead of 0 and 1. Make the
return type change also to tty_port_carrier_raised() that makes the
->carrier_raised() call (+ cd variable in moxa into which its return
value is stored).

Also cleans up a few unnecessary constructs related to this change:

	return xx ? 1 : 0;
	-> return xx;

	if (xx)
		return 1;
	return 0;
	-> return xx;

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
---
 drivers/char/pcmcia/synclink_cs.c | 8 +++-----
 drivers/mmc/core/sdio_uart.c      | 7 +++----
 drivers/tty/amiserial.c           | 2 +-
 drivers/tty/moxa.c                | 4 ++--
 drivers/tty/mxser.c               | 5 +++--
 drivers/tty/n_gsm.c               | 8 ++++----
 drivers/tty/serial/serial_core.c  | 9 ++++-----
 drivers/tty/synclink_gt.c         | 7 ++++---
 drivers/tty/tty_port.c            | 4 ++--
 drivers/usb/serial/ch341.c        | 7 +++----
 drivers/usb/serial/f81232.c       | 6 ++----
 drivers/usb/serial/pl2303.c       | 7 ++-----
 drivers/usb/serial/spcp8x5.c      | 7 ++-----
 drivers/usb/serial/usb-serial.c   | 4 ++--
 include/linux/tty_port.h          | 6 +++---
 include/linux/usb/serial.h        | 2 +-
 net/bluetooth/rfcomm/tty.c        | 2 +-
 17 files changed, 42 insertions(+), 53 deletions(-)

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index baa46e8a094b..4391138e1b8a 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -377,7 +377,7 @@ static void async_mode(MGSLPC_INFO *info);
 
 static void tx_timeout(struct timer_list *t);
 
-static int carrier_raised(struct tty_port *port);
+static bool carrier_raised(struct tty_port *port);
 static void dtr_rts(struct tty_port *port, int onoff);
 
 #if SYNCLINK_GENERIC_HDLC
@@ -2430,7 +2430,7 @@ static void mgslpc_hangup(struct tty_struct *tty)
 	tty_port_hangup(&info->port);
 }
 
-static int carrier_raised(struct tty_port *port)
+static bool carrier_raised(struct tty_port *port)
 {
 	MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
 	unsigned long flags;
@@ -2439,9 +2439,7 @@ static int carrier_raised(struct tty_port *port)
 	get_signals(info);
 	spin_unlock_irqrestore(&info->lock, flags);
 
-	if (info->serial_signals & SerialSignal_DCD)
-		return 1;
-	return 0;
+	return info->serial_signals & SerialSignal_DCD;
 }
 
 static void dtr_rts(struct tty_port *port, int onoff)
diff --git a/drivers/mmc/core/sdio_uart.c b/drivers/mmc/core/sdio_uart.c
index ae7ef2e038be..47f58258d8ff 100644
--- a/drivers/mmc/core/sdio_uart.c
+++ b/drivers/mmc/core/sdio_uart.c
@@ -526,7 +526,7 @@ static void sdio_uart_irq(struct sdio_func *func)
 	port->in_sdio_uart_irq = NULL;
 }
 
-static int uart_carrier_raised(struct tty_port *tport)
+static bool uart_carrier_raised(struct tty_port *tport)
 {
 	struct sdio_uart_port *port =
 			container_of(tport, struct sdio_uart_port, port);
@@ -535,9 +535,8 @@ static int uart_carrier_raised(struct tty_port *tport)
 		return 1;
 	ret = sdio_uart_get_mctrl(port);
 	sdio_uart_release_func(port);
-	if (ret & TIOCM_CAR)
-		return 1;
-	return 0;
+
+	return ret & TIOCM_CAR;
 }
 
 /**
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 460d33a1e70b..01c4fd3ce7c8 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1454,7 +1454,7 @@ static const struct tty_operations serial_ops = {
 	.proc_show = rs_proc_show,
 };
 
-static int amiga_carrier_raised(struct tty_port *port)
+static bool amiga_carrier_raised(struct tty_port *port)
 {
 	return !(ciab.pra & SER_DCD);
 }
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
index 2d9635e14ded..6a1e78e33a2c 100644
--- a/drivers/tty/moxa.c
+++ b/drivers/tty/moxa.c
@@ -501,7 +501,7 @@ static int moxa_tiocmset(struct tty_struct *tty,
 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 int moxa_carrier_raised(struct tty_port *);
+static bool moxa_carrier_raised(struct tty_port *);
 static void moxa_dtr_rts(struct tty_port *, int);
 /*
  * moxa board interface functions:
@@ -1432,7 +1432,7 @@ static void moxa_shutdown(struct tty_port *port)
 	MoxaPortFlushData(ch, 2);
 }
 
-static int moxa_carrier_raised(struct tty_port *port)
+static bool moxa_carrier_raised(struct tty_port *port)
 {
 	struct moxa_port *ch = container_of(port, struct moxa_port, port);
 	int dcd;
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 2926a831727d..96c72e691cd7 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -458,10 +458,11 @@ static void __mxser_stop_tx(struct mxser_port *info)
 	outb(info->IER, info->ioaddr + UART_IER);
 }
 
-static int mxser_carrier_raised(struct tty_port *port)
+static bool mxser_carrier_raised(struct tty_port *port)
 {
 	struct mxser_port *mp = container_of(port, struct mxser_port, port);
-	return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
+
+	return inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD;
 }
 
 static void mxser_dtr_rts(struct tty_port *port, int on)
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 631539c17d85..81fc2ec3693f 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -3770,16 +3770,16 @@ static int gsm_modem_update(struct gsm_dlci *dlci, u8 brk)
 	return -EPROTONOSUPPORT;
 }
 
-static int gsm_carrier_raised(struct tty_port *port)
+static bool gsm_carrier_raised(struct tty_port *port)
 {
 	struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
 	struct gsm_mux *gsm = dlci->gsm;
 
 	/* Not yet open so no carrier info */
 	if (dlci->state != DLCI_OPEN)
-		return 0;
+		return false;
 	if (debug & DBG_CD_ON)
-		return 1;
+		return true;
 
 	/*
 	 * Basic mode with control channel in ADM mode may not respond
@@ -3787,7 +3787,7 @@ static int gsm_carrier_raised(struct tty_port *port)
 	 */
 	if (gsm->encoding == GSM_BASIC_OPT &&
 	    gsm->dlci[0]->mode == DLCI_MODE_ADM && !dlci->modem_rx)
-		return 1;
+		return true;
 
 	return dlci->modem_rx & TIOCM_CD;
 }
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index f7074ac02801..20ed8a088b2d 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1861,7 +1861,7 @@ static void uart_port_shutdown(struct tty_port *port)
 	}
 }
 
-static int uart_carrier_raised(struct tty_port *port)
+static bool uart_carrier_raised(struct tty_port *port)
 {
 	struct uart_state *state = container_of(port, struct uart_state, port);
 	struct uart_port *uport;
@@ -1875,15 +1875,14 @@ static int uart_carrier_raised(struct tty_port *port)
 	 * continue and not sleep
 	 */
 	if (WARN_ON(!uport))
-		return 1;
+		return true;
 	spin_lock_irq(&uport->lock);
 	uart_enable_ms(uport);
 	mctrl = uport->ops->get_mctrl(uport);
 	spin_unlock_irq(&uport->lock);
 	uart_port_deref(uport);
-	if (mctrl & TIOCM_CAR)
-		return 1;
-	return 0;
+
+	return mctrl & TIOCM_CAR;
 }
 
 static void uart_dtr_rts(struct tty_port *port, int raise)
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 81c94906f06e..4ba71ec764f7 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -3126,7 +3126,7 @@ static int tiocmset(struct tty_struct *tty,
 	return 0;
 }
 
-static int carrier_raised(struct tty_port *port)
+static bool carrier_raised(struct tty_port *port)
 {
 	unsigned long flags;
 	struct slgt_info *info = container_of(port, struct slgt_info, port);
@@ -3134,7 +3134,8 @@ static int carrier_raised(struct tty_port *port)
 	spin_lock_irqsave(&info->lock,flags);
 	get_gtsignals(info);
 	spin_unlock_irqrestore(&info->lock,flags);
-	return (info->signals & SerialSignal_DCD) ? 1 : 0;
+
+	return info->signals & SerialSignal_DCD;
 }
 
 static void dtr_rts(struct tty_port *port, int on)
@@ -3162,7 +3163,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 	int		retval;
 	bool		do_clocal = false;
 	unsigned long	flags;
-	int		cd;
+	bool		cd;
 	struct tty_port *port = &info->port;
 
 	DBGINFO(("%s block_til_ready\n", tty->driver->name));
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 469de3c010b8..a573c500f95b 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -444,10 +444,10 @@ EXPORT_SYMBOL_GPL(tty_port_tty_wakeup);
  * to hide some internal details. This will eventually become entirely
  * internal to the tty port.
  */
-int tty_port_carrier_raised(struct tty_port *port)
+bool tty_port_carrier_raised(struct tty_port *port)
 {
 	if (port->ops->carrier_raised == NULL)
-		return 1;
+		return true;
 	return port->ops->carrier_raised(port);
 }
 EXPORT_SYMBOL(tty_port_carrier_raised);
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 6e1b87e67304..792f01a4ed22 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -413,12 +413,11 @@ static void ch341_port_remove(struct usb_serial_port *port)
 	kfree(priv);
 }
 
-static int ch341_carrier_raised(struct usb_serial_port *port)
+static bool ch341_carrier_raised(struct usb_serial_port *port)
 {
 	struct ch341_private *priv = usb_get_serial_port_data(port);
-	if (priv->msr & CH341_BIT_DCD)
-		return 1;
-	return 0;
+
+	return priv->msr & CH341_BIT_DCD;
 }
 
 static void ch341_dtr_rts(struct usb_serial_port *port, int on)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 891fb1fe69df..1a8c2925c26f 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -774,7 +774,7 @@ static bool f81232_tx_empty(struct usb_serial_port *port)
 	return true;
 }
 
-static int f81232_carrier_raised(struct usb_serial_port *port)
+static bool f81232_carrier_raised(struct usb_serial_port *port)
 {
 	u8 msr;
 	struct f81232_private *priv = usb_get_serial_port_data(port);
@@ -783,9 +783,7 @@ static int f81232_carrier_raised(struct usb_serial_port *port)
 	msr = priv->modem_status;
 	mutex_unlock(&priv->lock);
 
-	if (msr & UART_MSR_DCD)
-		return 1;
-	return 0;
+	return msr & UART_MSR_DCD;
 }
 
 static void f81232_get_serial(struct tty_struct *tty, struct serial_struct *ss)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 8949c1891164..4cb81746a149 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -1050,14 +1050,11 @@ static int pl2303_tiocmget(struct tty_struct *tty)
 	return result;
 }
 
-static int pl2303_carrier_raised(struct usb_serial_port *port)
+static bool pl2303_carrier_raised(struct usb_serial_port *port)
 {
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
 
-	if (priv->line_status & UART_DCD)
-		return 1;
-
-	return 0;
+	return priv->line_status & UART_DCD;
 }
 
 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index 09a972a838ee..8175db6c4554 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -247,16 +247,13 @@ static void spcp8x5_set_work_mode(struct usb_serial_port *port, u16 value,
 		dev_err(&port->dev, "failed to set work mode: %d\n", ret);
 }
 
-static int spcp8x5_carrier_raised(struct usb_serial_port *port)
+static bool spcp8x5_carrier_raised(struct usb_serial_port *port)
 {
 	u8 msr;
 	int ret;
 
 	ret = spcp8x5_get_msr(port, &msr);
-	if (ret || msr & MSR_STATUS_LINE_DCD)
-		return 1;
-
-	return 0;
+	return ret || msr & MSR_STATUS_LINE_DCD;
 }
 
 static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 164521ee10c6..019720a63fac 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -754,7 +754,7 @@ static struct usb_serial_driver *search_serial_device(
 	return NULL;
 }
 
-static int serial_port_carrier_raised(struct tty_port *port)
+static bool serial_port_carrier_raised(struct tty_port *port)
 {
 	struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
 	struct usb_serial_driver *drv = p->serial->type;
@@ -762,7 +762,7 @@ static int serial_port_carrier_raised(struct tty_port *port)
 	if (drv->carrier_raised)
 		return drv->carrier_raised(p);
 	/* No carrier control - don't block */
-	return 1;
+	return true;
 }
 
 static void serial_port_dtr_rts(struct tty_port *port, int on)
diff --git a/include/linux/tty_port.h b/include/linux/tty_port.h
index fa3c3bdaa234..cf098459cb01 100644
--- a/include/linux/tty_port.h
+++ b/include/linux/tty_port.h
@@ -15,7 +15,7 @@ struct tty_struct;
 
 /**
  * struct tty_port_operations -- operations on tty_port
- * @carrier_raised: return 1 if the carrier is raised on @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
  * @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
@@ -31,7 +31,7 @@ struct tty_struct;
  *	the port itself.
  */
 struct tty_port_operations {
-	int (*carrier_raised)(struct tty_port *port);
+	bool (*carrier_raised)(struct tty_port *port);
 	void (*dtr_rts)(struct tty_port *port, int raise);
 	void (*shutdown)(struct tty_port *port);
 	int (*activate)(struct tty_port *port, struct tty_struct *tty);
@@ -230,7 +230,7 @@ static inline void tty_port_set_kopened(struct tty_port *port, bool val)
 
 struct tty_struct *tty_port_tty_get(struct tty_port *port);
 void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
-int tty_port_carrier_raised(struct tty_port *port);
+bool tty_port_carrier_raised(struct tty_port *port);
 void tty_port_raise_dtr_rts(struct tty_port *port);
 void tty_port_lower_dtr_rts(struct tty_port *port);
 void tty_port_hangup(struct tty_port *port);
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index f7bfedb740f5..dc7f90522b42 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -293,7 +293,7 @@ struct usb_serial_driver {
 	/* 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);
-	int  (*carrier_raised)(struct usb_serial_port *port);
+	bool (*carrier_raised)(struct usb_serial_port *port);
 	/* Called by the usb serial hooks to allow the user to rework the
 	   termios state */
 	void (*init_termios)(struct tty_struct *tty);
diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 8009e0e93216..5697df9d4394 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -119,7 +119,7 @@ static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty)
 }
 
 /* we block the open until the dlc->state becomes BT_CONNECTED */
-static int rfcomm_dev_carrier_raised(struct tty_port *port)
+static bool rfcomm_dev_carrier_raised(struct tty_port *port)
 {
 	struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
 
-- 
2.30.2


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