linux-kernel - Re: [PATCH v2 next 3/5] iio: sca3000: stop interrupts via devm_add_action_or

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Message-ID: <2c106b65-7fae-433f-9a44-4b295a43e2f0@oracle.com>
Date: Tue, 3 Feb 2026 15:57:18 +0530
From: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To: David Lechner <dlechner@...libre.com>,
        Jonathan Cameron
 <jic23@...nel.org>,
        Nuno Sá <nuno.sa@...log.com>,
        Andy Shevchenko <andy@...nel.org>,
        Andrew Ijano <andrew.ijano@...il.com>,
        Antoniu Miclaus <antoniu.miclaus@...log.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org, error27@...il.com,
        andriy.shevchenko@...el.com
Subject: Re: [PATCH v2 next 3/5] iio: sca3000: stop interrupts via
 devm_add_action_or_reset()

Hi David,


On 03/02/26 04:34, David Lechner wrote:
> 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@...el.com>
>> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
>> ---
>> 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.

Thanks for the review, Sure, will remove this extra wrapper and add the 
needed things in the same sca3000_stop_all_interrupts() function.

Regards,
Harshit
>