linux-kernel - Re: [PATCH v3 06/14] serial: liteuart: move tty_flip_buffer

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Message-ID: <fd1b8455-47eb-3161-4076-136e3265155@linux.intel.com>
Date:   Tue, 15 Nov 2022 17:38:12 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Gabriel Somlo <gsomlo@...il.com>
cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        kgugala@...micro.com, mholenko@...micro.com, joel@....id.au,
        david.abdurachmanov@...il.com, florent@...oy-digital.fr,
        geert@...ux-m68k.org
Subject: Re: [PATCH v3 06/14] serial: liteuart: move tty_flip_buffer_push()
 out of rx loop

On Sat, 12 Nov 2022, Gabriel Somlo wrote:

> Calling tty_flip_buffer_push() for each individual received character
> is overkill. Move it out of the rx loop, and only call it once per
> set of characters received together.
> 
> Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
> ---
>  drivers/tty/serial/liteuart.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
> index 047d5ad32e13..ff3486860989 100644
> --- a/drivers/tty/serial/liteuart.c
> +++ b/drivers/tty/serial/liteuart.c
> @@ -86,10 +86,10 @@ static void liteuart_timer(struct timer_list *t)
>  		/* no overflow bits in status */
>  		if (!(uart_handle_sysrq_char(port, ch)))
>  			uart_insert_char(port, status, 0, ch, flg);
> -
> -		tty_flip_buffer_push(&port->state->port);
>  	}
>  
> +	tty_flip_buffer_push(&port->state->port);
> +
>  	mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));
>  }

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

-- 
 i.