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

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Date:   Mon, 21 Nov 2022 09:42:39 +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 21. 11. 22, 9:37, Jiri Slaby wrote:
> 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.

Actually, even 0 directly, provided overrun parameter is always 0.

> The while's 
> condition would simply look like (!litex_read8(membase + OFF_RXEMPTY)) 
> then.
> 
>>           ch = litex_read8(membase + OFF_RXTX);
> 
> thanks,

-- 
js