Re: [PATCH v2 next 3/5] iio: sca3000: stop interrupts via devm_add_action_or_reset()

[David Lechner]

On 2/2/26 1:40 PM, Harshit Mogalapalli wrote:
> sca3000_stop_all_interrupts() is moved above the probe routine so the
> new function sca3000_disable_interrupts() used in probe can directly
> call it without additional declaration.
> 
> Used devm_add_action_or_reset() for shutting down the interrupts.
> 
> No functional change intended.
> 
> Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
> ---
> v1->v2: Jonathan found a broken tear down sequence that was introduced
> by my ptach 3 in v1: https://lore.kernel.org/all/20260131163218.2a4b93e5@jic23-huawei/
> 
> So first converted the interrupt disabling task to devm based call,
> order of tear down is as follows after this patch: iio_unregister_device
> is called in the remove() callback, post which any interrupts will be
> disabled with devm_add_action_or_reset() call.
> ---
>  drivers/iio/accel/sca3000.c | 53 ++++++++++++++++++++++---------------
>  1 file changed, 31 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/iio/accel/sca3000.c b/drivers/iio/accel/sca3000.c
> index 37ef724d5dc5..4faffeea328c 100644
> --- a/drivers/iio/accel/sca3000.c
> +++ b/drivers/iio/accel/sca3000.c
> @@ -1437,6 +1437,33 @@ static const struct iio_info sca3000_info = {
>  	.write_event_config = &sca3000_write_event_config,
>  };
>  
> +static int sca3000_stop_all_interrupts(struct sca3000_state *st)

Return value is ignored now, so we can make this void and not return.

> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = sca3000_read_data_short(st, SCA3000_REG_INT_MASK_ADDR, 1);
> +	if (ret)
> +		goto error_ret;
> +	ret = sca3000_write_reg(st, SCA3000_REG_INT_MASK_ADDR,
> +				(st->rx[0] &
> +				 ~(SCA3000_REG_INT_MASK_RING_THREE_QUARTER |
> +				   SCA3000_REG_INT_MASK_RING_HALF |
> +				   SCA3000_REG_INT_MASK_ALL_INTS)));
> +error_ret:
> +	mutex_unlock(&st->lock);
> +	return ret;
> +}
> +
> +static void sca3000_disable_interrupts(void *data)
> +{
> +	struct iio_dev *indio_dev = data;
> +	struct sca3000_state *st = iio_priv(indio_dev);
> +
> +	/* Must ensure no interrupts can be generated after this! */
> +	sca3000_stop_all_interrupts(st);
> +}

This wrapper doesn't seem necessary. We can combine to two functions
above into one.