linux-kernel - Re: [PATCH v5 09/14] serial: liteuart: fix rx loop variable types

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Date:   Mon, 21 Nov 2022 09:37:12 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Gabriel Somlo <gsomlo@...il.com>, linux-kernel@...r.kernel.org
Cc:     linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        kgugala@...micro.com, mholenko@...micro.com, joel@....id.au,
        david.abdurachmanov@...il.com, florent@...oy-digital.fr,
        geert@...ux-m68k.org, ilpo.jarvinen@...ux.intel.com
Subject: Re: [PATCH v5 09/14] serial: liteuart: fix rx loop variable types

On 18. 11. 22, 15:55, Gabriel Somlo wrote:
> Update variable types to match the signature of uart_insert_char()
> which consumes them.
> 
> Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
>   drivers/tty/serial/liteuart.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
> index 81aa7c1da73c..42ac9aee050a 100644
> --- a/drivers/tty/serial/liteuart.c
> +++ b/drivers/tty/serial/liteuart.c
> @@ -73,8 +73,7 @@ static void liteuart_timer(struct timer_list *t)
>   	struct liteuart_port *uart = from_timer(uart, t, timer);
>   	struct uart_port *port = &uart->port;
>   	unsigned char __iomem *membase = port->membase;
> -	int ch;
> -	unsigned long status;
> +	unsigned int status, ch;

These should be u8 after all, right?

Wait, status is a bool in the end:

>   	while ((status = !litex_read8(membase + OFF_RXEMPTY)) == 1) {

But why is it passed to uart_insert_char() as such? That's ugly. Maybe 
drop all of this "status" and pass LSR_RXC directly. The while's 
condition would simply look like (!litex_read8(membase + OFF_RXEMPTY)) then.

>   		ch = litex_read8(membase + OFF_RXTX);

thanks,
-- 
js
suse labs