linux-kernel - Re: [PATCH v5 10/14] serial: liteuart: separate rx loop from poll timer

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Date:   Mon, 21 Nov 2022 11:16:14 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
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,
        ilpo.jarvinen@...ux.intel.com
Subject: Re: [PATCH v5 10/14] serial: liteuart: separate rx loop from poll timer

Hi Gabriel,

On Fri, Nov 18, 2022 at 3:57 PM Gabriel Somlo <gsomlo@...il.com> wrote:
> Convert the rx loop into its own dedicated function, and (for now)
> call it from the poll timer. This is in preparation for adding irq
> support to the receive path.
>
> Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Thanks for your patch!

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

> --- a/drivers/tty/serial/liteuart.c
> +++ b/drivers/tty/serial/liteuart.c
> @@ -68,10 +68,8 @@ static struct uart_driver liteuart_driver = {
>  #endif
>  };
>
> -static void liteuart_timer(struct timer_list *t)
> +static void liteuart_rx_chars(struct uart_port *port)

So first you spin this off into a separate function, so it can be
called from both the interrupt and polling paths.
Later, in "[PATCH v5 12/14] serial: liteuart: add IRQ support for the
RX path", you remove the call from the polling path...


>  {
> -       struct liteuart_port *uart = from_timer(uart, t, timer);
> -       struct uart_port *port = &uart->port;
>         unsigned char __iomem *membase = port->membase;
>         unsigned int status, ch;
>
> @@ -88,6 +86,14 @@ static void liteuart_timer(struct timer_list *t)
>         }
>
>         tty_flip_buffer_push(&port->state->port);
> +}
> +
> +static void liteuart_timer(struct timer_list *t)
> +{
> +       struct liteuart_port *uart = from_timer(uart, t, timer);
> +       struct uart_port *port = &uart->port;
> +
> +       liteuart_rx_chars(port);
>
>         mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));
>  }

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds