linux-kernel - Re: [PATCH v8 10/22] counter: Standardize to ERANGE for limit exceeded errors

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Message-ID: <20210214171021.41b3e4e3@archlinux>
Date:   Sun, 14 Feb 2021 17:10:21 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     kernel@...gutronix.de, linux-stm32@...md-mailman.stormreply.com,
        a.fatoum@...gutronix.de, kamel.bouhara@...tlin.com,
        gwendal@...omium.org, alexandre.belloni@...tlin.com,
        david@...hnology.com, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        syednwaris@...il.com, patrick.havelange@...ensium.com,
        fabrice.gasnier@...com, mcoquelin.stm32@...il.com,
        alexandre.torgue@...com, o.rempel@...gutronix.de
Subject: Re: [PATCH v8 10/22] counter: Standardize to ERANGE for limit
 exceeded errors

On Fri, 12 Feb 2021 21:13:34 +0900
William Breathitt Gray <vilhelm.gray@...il.com> wrote:

> ERANGE is a semantically better error code to return when an argument
> value falls outside the supported limit range of a device.

#define	ERANGE		34	/* Math result not representable */

Not generally applicable to a parameter being out of range
despite the name.
#define	EINVAL		22	/* Invalid argument */
Is probably closer to what we want to describe here.

Jonathan


> 
> Cc: Syed Nayyar Waris <syednwaris@...il.com>
> Cc: Fabrice Gasnier <fabrice.gasnier@...com>
> Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
> Cc: Alexandre Torgue <alexandre.torgue@...com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> ---
>  drivers/counter/104-quad-8.c        | 6 +++---
>  drivers/counter/stm32-lptimer-cnt.c | 2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index 674263b4d2c4..a2cabb028db0 100644
> --- a/drivers/counter/104-quad-8.c
> +++ b/drivers/counter/104-quad-8.c
> @@ -154,7 +154,7 @@ static int quad8_count_write(struct counter_device *counter,
>  
>  	/* Only 24-bit values are supported */
>  	if (val > 0xFFFFFF)
> -		return -EINVAL;
> +		return -ERANGE;
>  
>  	mutex_lock(&priv->lock);
>  
> @@ -671,7 +671,7 @@ static ssize_t quad8_count_preset_write(struct counter_device *counter,
>  
>  	/* Only 24-bit values are supported */
>  	if (preset > 0xFFFFFF)
> -		return -EINVAL;
> +		return -ERANGE;
>  
>  	mutex_lock(&priv->lock);
>  
> @@ -716,7 +716,7 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
>  
>  	/* Only 24-bit values are supported */
>  	if (ceiling > 0xFFFFFF)
> -		return -EINVAL;
> +		return -ERANGE;
>  
>  	mutex_lock(&priv->lock);
>  
> diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
> index daf988e7b208..d5f9d580d06d 100644
> --- a/drivers/counter/stm32-lptimer-cnt.c
> +++ b/drivers/counter/stm32-lptimer-cnt.c
> @@ -283,7 +283,7 @@ static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
>  		return ret;
>  
>  	if (ceiling > STM32_LPTIM_MAX_ARR)
> -		return -EINVAL;
> +		return -ERANGE;
>  
>  	priv->ceiling = ceiling;
>