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Subject: Re: [Linux-stm32] [PATCH v10 19/33] counter: Standardize to ERANGE
 for limit exceeded errors
To:     William Breathitt Gray <vilhelm.gray@gmail.com>, <jic23@kernel.org>
CC:     <kamel.bouhara@bootlin.com>, <gwendal@chromium.org>,
        <david@lechnology.com>, <linux-iio@vger.kernel.org>,
        <patrick.havelange@essensium.com>, <alexandre.belloni@bootlin.com>,
        <mcoquelin.stm32@gmail.com>, <linux-kernel@vger.kernel.org>,
        <o.rempel@pengutronix.de>, <kernel@pengutronix.de>,
        <fabrice.gasnier@st.com>, <syednwaris@gmail.com>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-arm-kernel@lists.infradead.org>, <alexandre.torgue@st.com>
References: <cover.1616150619.git.vilhelm.gray@gmail.com>
 <f09068dd8b89aa81c4310ea39cbdb0d631dddf98.1616150619.git.vilhelm.gray@gmail.com>
From:   Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Message-ID: <1510a9e6-d1d3-c370-488d-42874f28d129@foss.st.com>
Date:   Mon, 22 Mar 2021 17:29:25 +0100
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On 3/19/21 12:00 PM, William Breathitt Gray wrote:
> ERANGE is a semantically better error code to return when an argument
> value falls outside the supported limit range of a device.
> 
> Cc: Syed Nayyar Waris <syednwaris@gmail.com>
> Cc: Oleksij Rempel <o.rempel@pengutronix.de>
> Cc: Fabrice Gasnier <fabrice.gasnier@st.com>
> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> Cc: Alexandre Torgue <alexandre.torgue@st.com>
> Reviewed-by: David Lechner <david@lechnology.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
> ---
>  drivers/counter/104-quad-8.c        | 6 +++---
>  drivers/counter/interrupt-cnt.c     | 3 +++
>  drivers/counter/stm32-lptimer-cnt.c | 2 +-
>  3 files changed, 7 insertions(+), 4 deletions(-)

Hi William,

For the STM32 driver, you can add my:
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>

Thanks,
Fabrice

> 
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index b7d6c1c43655..0409b1771fd9 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);
>  
> @@ -669,7 +669,7 @@ 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);
>  
> @@ -714,7 +714,7 @@ 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/interrupt-cnt.c b/drivers/counter/interrupt-cnt.c
> index 0e07607f2cd3..f27dea317965 100644
> --- a/drivers/counter/interrupt-cnt.c
> +++ b/drivers/counter/interrupt-cnt.c
> @@ -107,6 +107,9 @@ static int interrupt_cnt_write(struct counter_device *counter,
>  {
>  	struct interrupt_cnt_priv *priv = counter->priv;
>  
> +	if (val != (typeof(priv->count.counter))val)
> +		return -ERANGE;
> +
>  	atomic_set(&priv->count, val);
>  
>  	return 0;
> diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
> index 78f383b77bd2..49aeb9e393f3 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;
>  
>