linux-kernel - Re: [PATCH v2 19/25] tty: serial: samsung

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Message-ID: <20210215184012.sf6p6dbk5c25phdm@kozik-lap>
Date:   Mon, 15 Feb 2021 19:40:12 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Hector Martin <marcan@...can.st>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>, Rob Herring <robh@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 19/25] tty: serial: samsung_tty: IRQ rework

On Mon, Feb 15, 2021 at 09:17:07PM +0900, Hector Martin wrote:
> * Split out s3c24xx_serial_tx_chars from s3c24xx_serial_tx_irq,
>   where only the latter acquires the port lock.

I miss here information why you do all this.

> 
> * For S3C64xx, return IRQ_NONE if no flag bits were set, so the
>   interrupt core can detect IRQ storms. Note that both IRQ handlers
>   always return IRQ_HANDLED anyway, so 'or' logic isn't necessary here,
>   if either handler ran we are always going to return IRQ_HANDLED.

It looks like separate patch. Your patches should do only one thing at
once. The fact that you have here three bullet points is a warning
sign. This is even more important if you do some refactorings and
cleanups which should not affect functionality. Hiding there changes
which could affect functionality is a no-go.

> 
> * Rename s3c24xx_serial_rx_chars to s3c24xx_serial_rx_irq for
>   consistency with the above. All it does now is call two other
>   functions anyway.

Separate patch for trivial renaming.

> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  drivers/tty/serial/samsung_tty.c | 41 +++++++++++++++++++-------------
>  1 file changed, 24 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 21955be680a4..821cd0e4f870 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -151,6 +151,9 @@ struct s3c24xx_uart_port {
>  #endif
>  };
>  
> +static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
> +static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport);
> +
>  /* conversion functions */
>  
>  #define s3c24xx_dev_to_port(__dev) dev_get_drvdata(__dev)
> @@ -316,8 +319,6 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
>  	ourport->tx_mode = 0;
>  }
>  
> -static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport);
> -

Why moving this? Why adding s3c24xx_serial_tx_chars() forward
declaration?

Best regards,
Krzysztof