linux-kernel - Re: [PATCH v2] serial: samsung: honor fifosize from dts at first

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Date: Tue, 6 Feb 2024 11:12:22 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Tamseel Shams <m.shams@...sung.com>, alim.akhtar@...sung.com,
 krzysztof.kozlowski+dt@...aro.org, gregkh@...uxfoundation.org,
 jirislaby@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v2] serial: samsung: honor fifosize from dts at first

On 05/02/2024 09:24, Tamseel Shams wrote:
> Currently for platforms which passes UART fifosize from DT gets
> override by local driver structure "s3c24xx_serial_drv_data",
> which is not intended. Change the code to honor fifosize from
> device tree at first.
> 
> Signed-off-by: Tamseel Shams <m.shams@...sung.com>
> ---
> Change Log:
> v1 -> v2:
> Acknowledged Krzysztof's comments
> Initialized "ret" variable
> 
>  drivers/tty/serial/samsung_tty.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 71d17d804fda..e5dc2c32b1bd 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -1952,7 +1952,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
>  	struct device_node *np = pdev->dev.of_node;
>  	struct s3c24xx_uart_port *ourport;
>  	int index = probe_index;
> -	int ret, prop = 0;
> +	int ret = 1, prop = 0;

I am sorry, but return of probe function cannot be positive.

>  
>  	if (np) {
>  		ret = of_alias_get_id(np, "serial");
> @@ -1990,8 +1990,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
>  	}
>  
>  	if (np) {
> -		of_property_read_u32(np,
> -			"samsung,uart-fifosize", &ourport->port.fifosize);
> +		ret = of_property_read_u32(np, "samsung,uart-fifosize", &ourport->port.fifosize);
>  
>  		if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
>  			switch (prop) {
> @@ -2009,10 +2008,13 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	if (ourport->drv_data->fifosize[index])
> -		ourport->port.fifosize = ourport->drv_data->fifosize[index];
> -	else if (ourport->info->fifosize)
> -		ourport->port.fifosize = ourport->info->fifosize;
> +	if (ret) {

Are you sure that you are checking correct ret?

Best regards,
Krzysztof