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Message-ID: <CAPDyKFo4=AtY=iijz6ye5oPk9Jqr=JUfEPZ2kzp-Gmd7Yc7Ajg@mail.gmail.com>
Date: Fri, 13 Jan 2023 12:50:08 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-serial@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
Johan Hovold <johan@...nel.org>,
Samuel Iglesias Gonsálvez <siglesias@...lia.com>,
Rodolfo Giometti <giometti@...eenne.com>,
Arnd Bergmann <arnd@...db.de>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
Marcel Holtmann <marcel@...tmann.org>,
Johan Hedberg <johan.hedberg@...il.com>,
Luiz Augusto von Dentz <luiz.dentz@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-usb@...r.kernel.org, linux-bluetooth@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH v3 06/13] tty: Convert ->carrier_raised() and callchains
to bool
On Wed, 11 Jan 2023 at 15:24, Ilpo Järvinen
<ilpo.jarvinen@...ux.intel.com> wrote:
>
> 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@...nel.org>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Acked-by: Ulf Hansson <ulf.hansson@...aro.org> # For MMC
Kind regards
Uffe
> ---
> 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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