linux-kernel - Re: [PATCH 25/33] serial: 8250: lcr compute cleanup

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Message-ID: <bf099c75-eb83-a0c0-3656-36880a9a0ce7@linux.intel.com>
Date: Wed, 11 Jun 2025 16:03:19 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    linux-serial <linux-serial@...r.kernel.org>, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 25/33] serial: 8250: lcr compute cleanup

On Wed, 11 Jun 2025, Jiri Slaby (SUSE) wrote:

> * use 'lcr' as variable containing the "computed value" (and not 'cval')
> * use 'u8' for the type (and not 'unsigned char')
> * drop useless comment
> 
> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.

> ---
>  drivers/tty/serial/8250/8250_port.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
> index 85b75ff0699e..2af89038e50e 100644
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -2547,23 +2547,20 @@ static unsigned int serial8250_get_divisor(struct uart_port *port,
>  	return serial8250_do_get_divisor(port, baud, frac);
>  }
>  
> -static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
> -					    tcflag_t c_cflag)
> +static unsigned char serial8250_compute_lcr(struct uart_8250_port *up, tcflag_t c_cflag)
>  {
> -	unsigned char cval;
> -
> -	cval = UART_LCR_WLEN(tty_get_char_size(c_cflag));
> +	u8 lcr = UART_LCR_WLEN(tty_get_char_size(c_cflag));
>  
>  	if (c_cflag & CSTOPB)
> -		cval |= UART_LCR_STOP;
> +		lcr |= UART_LCR_STOP;
>  	if (c_cflag & PARENB)
> -		cval |= UART_LCR_PARITY;
> +		lcr |= UART_LCR_PARITY;
>  	if (!(c_cflag & PARODD))
> -		cval |= UART_LCR_EPAR;
> +		lcr |= UART_LCR_EPAR;
>  	if (c_cflag & CMSPAR)
> -		cval |= UART_LCR_SPAR;
> +		lcr |= UART_LCR_SPAR;
>  
> -	return cval;
> +	return lcr;
>  }
>  
>  void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
> @@ -2821,12 +2818,12 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
>  		          const struct ktermios *old)
>  {
>  	struct uart_8250_port *up = up_to_u8250p(port);
> -	unsigned char cval;
>  	unsigned long flags;
>  	unsigned int baud, quot, frac = 0;
> +	u8 lcr;
>  
>  	serial8250_set_mini(port, termios);
> -	cval = serial8250_compute_lcr(up, termios->c_cflag);
> +	lcr = serial8250_compute_lcr(up, termios->c_cflag);
>  	baud = serial8250_get_baud_rate(port, termios, old);
>  	quot = serial8250_get_divisor(port, baud, &frac);
>  
> @@ -2839,7 +2836,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
>  	serial8250_rpm_get(up);
>  	uart_port_lock_irqsave(port, &flags);
>  
> -	up->lcr = cval;					/* Save computed LCR */
> +	up->lcr = lcr;
>  	serial8250_set_trigger_for_slow_speed(port, termios, baud);
>  	serial8250_set_afe(port, termios);
>  	uart_update_timeout(port, termios->c_cflag, baud);
>