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

[Jonathan Cameron]

On Fri, 12 Feb 2021 21:13:34 +0900
William Breathitt Gray <vilhelm.gray@xxxxxxxxx> 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@xxxxxxxxx>
> Cc: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
> Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
> Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
> ---
>  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;
>