linux-kernel - Re: [PATCH] iio: imu: inv_icm42600: change invalid data error to EBUSY

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Message-ID: <20250809202440.552e1cdf@jic23-huawei>
Date: Sat, 9 Aug 2025 20:24:40 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Jean-Baptiste Maneyrol via B4 Relay
 <devnull+jean-baptiste.maneyrol.tdk.com@...nel.org>
Cc: jean-baptiste.maneyrol@....com, David Lechner <dlechner@...libre.com>,
 Nuno Sá <nuno.sa@...log.com>, Andy Shevchenko
 <andy@...nel.org>, Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, Sean Nyekjaer
 <sean@...nix.com>
Subject: Re: [PATCH] iio: imu: inv_icm42600: change invalid data error to
 EBUSY

On Fri, 08 Aug 2025 09:40:10 +0200
Jean-Baptiste Maneyrol via B4 Relay <devnull+jean-baptiste.maneyrol.tdk.com@...nel.org> wrote:

> From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>
> 
> Temperature sensor returns the temperature of the mechanical parts
> of the chip. If both accel and gyro are off, temperature sensor is
> also automatically turned off and return invalid data.
> 
> In this case, returning EBUSY error code is better then EINVAL and
> indicates userspace that it needs to retry reading temperature in
> another context.
> 
> Fixes: bc3eb0207fb5 ("iio: imu: inv_icm42600: add temperature sensor support")
> Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>
> Cc: stable@...r.kernel.org
+CC Sean who raised the issue.

> ---
>  drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c
> index 8b15afca498cb5dfa7e056a60d3c78e419f11b29..1756f3d07049a26038776a35d9242f3dd1320354 100644
> --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c
> +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c
> @@ -32,8 +32,12 @@ static int inv_icm42600_temp_read(struct inv_icm42600_state *st, s16 *temp)
>  		goto exit;
>  
>  	*temp = (s16)be16_to_cpup(raw);
> +	/*
> +	 * Temperature data is invalid if both accel and gyro are off.
> +	 * Return EBUSY in this case.
> +	 */
>  	if (*temp == INV_ICM42600_DATA_INVALID)
> -		ret = -EINVAL;
> +		ret = -EBUSY;
>  
>  exit:
>  	mutex_unlock(&st->lock);
> 
> ---
> base-commit: 6408dba154079656d069a6a25fb3a8954959474c
> change-id: 20250807-inv-icm42600-change-temperature-error-code-65d16a98c6e1
> 
> Best regards,