linux-kernel - Re: [PATCH] ata: ahci_ceva: return of_property_read_u8

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Message-ID: <565d1ac6-2cdc-4168-a8c6-355912a39d75@kernel.org>
Date: Fri, 22 Mar 2024 08:58:15 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>, cassel@...nel.org
Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH] ata: ahci_ceva: return of_property_read_u8_array() error
 code

On 3/21/24 03:51, Radhey Shyam Pandey wrote:
> In the ahci_ceva_probe() error path instead of returning -EINVAL for all
> of_property_read_u8_array() failure types return the actual error code.
> It removes the redundant -EINVAL assignment at multiple places and
> improves the error handling path.
> 
> Reported-by: Markus Elfring <Markus.Elfring@....de>
> Closes: https://lore.kernel.org/all/9427c0fd-f48a-4104-ac7e-2929be3562af@web.de/
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> ---
>  drivers/ata/ahci_ceva.c | 48 ++++++++++++++++++++---------------------
>  1 file changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/ata/ahci_ceva.c b/drivers/ata/ahci_ceva.c
> index 11a2c199a7c2..b54ee80c068f 100644
> --- a/drivers/ata/ahci_ceva.c
> +++ b/drivers/ata/ahci_ceva.c
> @@ -274,62 +274,62 @@ static int ceva_ahci_probe(struct platform_device *pdev)
>  		cevapriv->flags = CEVA_FLAG_BROKEN_GEN2;
>  
>  	/* Read OOB timing value for COMINIT from device-tree */
> -	if (of_property_read_u8_array(np, "ceva,p0-cominit-params",
> -					(u8 *)&cevapriv->pp2c[0], 4) < 0) {
> +	rc = of_property_read_u8_array(np, "ceva,p0-cominit-params",
> +				       (u8 *)&cevapriv->pp2c[0], 4);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p0-cominit-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  
> -	if (of_property_read_u8_array(np, "ceva,p1-cominit-params",
> -					(u8 *)&cevapriv->pp2c[1], 4) < 0) {
> +	rc = of_property_read_u8_array(np, "ceva,p1-cominit-params",
> +				       (u8 *)&cevapriv->pp2c[1], 4);
> +	if (rc < 0) {

This can be more simply "if (rc)"

>  		dev_warn(dev, "ceva,p1-cominit-params property not defined\n");
> -		rc = -EINVAL;

Here, it may be better to do:

		rc = dev_err_probe(dev, rc, "...");

and remove the dev_warn, as that really should be a dev_err() anyway.
Same pattern for all the other property reads below.

>  		goto disable_resources;
>  	}
>  
>  	/* Read OOB timing value for COMWAKE from device-tree*/
> -	if (of_property_read_u8_array(np, "ceva,p0-comwake-params",
> -					(u8 *)&cevapriv->pp3c[0], 4) < 0) {
> +	rc = of_property_read_u8_array(np, "ceva,p0-comwake-params",
> +				       (u8 *)&cevapriv->pp3c[0], 4);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p0-comwake-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  
> -	if (of_property_read_u8_array(np, "ceva,p1-comwake-params",
> -					(u8 *)&cevapriv->pp3c[1], 4) < 0) {
> +	rc = of_property_read_u8_array(np, "ceva,p1-comwake-params",
> +				       (u8 *)&cevapriv->pp3c[1], 4);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p1-comwake-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  
>  	/* Read phy BURST timing value from device-tree */
> -	if (of_property_read_u8_array(np, "ceva,p0-burst-params",
> -					(u8 *)&cevapriv->pp4c[0], 4) < 0) {
> +	rc = of_property_read_u8_array(np, "ceva,p0-burst-params",
> +				       (u8 *)&cevapriv->pp4c[0], 4);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p0-burst-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  
> -	if (of_property_read_u8_array(np, "ceva,p1-burst-params",
> -					(u8 *)&cevapriv->pp4c[1], 4) < 0) {
> +	rc = of_property_read_u8_array(np, "ceva,p1-burst-params",
> +				       (u8 *)&cevapriv->pp4c[1], 4);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p1-burst-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  
>  	/* Read phy RETRY interval timing value from device-tree */
> -	if (of_property_read_u16_array(np, "ceva,p0-retry-params",
> -					(u16 *)&cevapriv->pp5c[0], 2) < 0) {
> +	rc = of_property_read_u16_array(np, "ceva,p0-retry-params",
> +					(u16 *)&cevapriv->pp5c[0], 2);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p0-retry-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  
> -	if (of_property_read_u16_array(np, "ceva,p1-retry-params",
> -					(u16 *)&cevapriv->pp5c[1], 2) < 0) {
> +	rc = of_property_read_u16_array(np, "ceva,p1-retry-params",
> +					(u16 *)&cevapriv->pp5c[1], 2);
> +	if (rc < 0) {
>  		dev_warn(dev, "ceva,p1-retry-params property not defined\n");
> -		rc = -EINVAL;
>  		goto disable_resources;
>  	}
>  

-- 
Damien Le Moal
Western Digital Research