Re: [PATCH v4 2/2] iio: accel: adxl372: convert to guard(mutex)

[Jonathan Cameron <jic23@kernel.org>]

On Sat,  7 Mar 2026 17:19:12 +0530
Rajveer Chaudhari <rajveer.chaudhari.linux@gmail.com> wrote:

> Replace manual mutex_lock/mutex_unlock pair with guard(mutex) in
> adxl372_write_threshold_value(). This ensures the mutex is released
> on all return paths and allows returning directly without a goto label.
> 
> Signed-off-by: Rajveer Chaudhari <rajveer.chaudhari.linux@gmail.com>
Series applied. One small tweak mentioned below.

Applied to the testing branch of iio.git where the bots poke at it
briefly before I push it out as togreg which linux-next picks up.

Thanks,

Jonathan

> ---
> v4: Changelog moved below --- as requested by Jonathan Cameron.
> v3: Return directly from error path without goto.
> v2: Split into separate patch per driver.
> ---
>  drivers/iio/accel/adxl372.c | 13 +++++--------
>  1 file changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
> index 28a8793a53b6..4bf8656991ea 100644
> --- a/drivers/iio/accel/adxl372.c
> +++ b/drivers/iio/accel/adxl372.c
> @@ -7,6 +7,7 @@
>  
>  #include <linux/bitfield.h>
>  #include <linux/bitops.h>
> +#include <linux/cleanup.h>
>  #include <linux/interrupt.h>
>  #include <linux/irq.h>
>  #include <linux/module.h>
> @@ -336,18 +337,14 @@ static ssize_t adxl372_write_threshold_value(struct iio_dev *indio_dev, unsigned
>  	struct adxl372_state *st = iio_priv(indio_dev);
>  	int ret;
>  
> -	mutex_lock(&st->threshold_m);
> +	guard(mutex)(&st->threshold_m);
> +
>  	ret = regmap_write(st->regmap, addr, ADXL372_THRESH_VAL_H_SEL(threshold));
>  	if (ret < 0)
> -		goto unlock;
> +		return ret;
>  
> -	ret = regmap_update_bits(st->regmap, addr + 1, GENMASK(7, 5),
> +	return regmap_update_bits(st->regmap, addr + 1, GENMASK(7, 5),
>  				 ADXL372_THRESH_VAL_L_SEL(threshold) << 5);

I'd expect a minor indent update to be needed here.  1 more space.

> -
> -unlock:
> -	mutex_unlock(&st->threshold_m);
> -
> -	return ret;
>  }
>  
>  static int adxl372_read_axis(struct adxl372_state *st, u8 addr)