Re: [PATCH v3] iio: adc: qcom-spmi-iadc: balance enable_irq_wake() on driver unbind

[Jonathan Cameron]

On Fri, 29 May 2026 14:56:48 +0500
Stepan Ionichev <sozdayvek@xxxxxxxxx> wrote:

> iadc_probe() calls enable_irq_wake() after a successful
> devm_request_irq(), but the driver has no remove callback or
> matching disable_irq_wake(), so the wake reference count on the
> IRQ is leaked on module unload or driver unbind.
> 
> Check the IRQ request error first, then register a devm action
> that calls disable_irq_wake() so the wake reference is released
> in the same scope as the enable. While here, drop the inverted
> "if (!ret) ... else return ret" in favour of the standard
> "if (ret) return ret;" pattern.
> 
> Fixes: ce0694841ea6 ("iio: iadc: Qualcomm SPMI PMIC current ADC driver")
> Signed-off-by: Stepan Ionichev <sozdayvek@xxxxxxxxx>

+CC Bjorn and Konrad as we don't seem to have a more specific
maintainer for this driver.

Seems low risk, but nice to run it past them.

Thanks,

Jonathan

> ---
> v3:
> - Add Fixes tag (Jonathan)
> 
> v2: https://lore.kernel.org/all/20260523134613.4930-1-sozdayvek@xxxxxxxxx/
> v1: https://lore.kernel.org/all/20260520190924.12774-1-sozdayvek@xxxxxxxxx/
> 
>  drivers/iio/adc/qcom-spmi-iadc.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/qcom-spmi-iadc.c b/drivers/iio/adc/qcom-spmi-iadc.c
> index b64a8a407168..88f6be2108e7 100644
> --- a/drivers/iio/adc/qcom-spmi-iadc.c
> +++ b/drivers/iio/adc/qcom-spmi-iadc.c
> @@ -481,6 +481,11 @@ static const struct iio_chan_spec iadc_channels[] = {
>  	},
>  };
>  
> +static void iadc_disable_irq_wake(void *data)
> +{
> +	disable_irq_wake((long)data);
> +}
> +
>  static int iadc_probe(struct platform_device *pdev)
>  {
>  	struct device_node *node = pdev->dev.of_node;
> @@ -538,9 +543,16 @@ static int iadc_probe(struct platform_device *pdev)
>  	if (!iadc->poll_eoc) {
>  		ret = devm_request_irq(dev, irq_eoc, iadc_isr, 0,
>  					"spmi-iadc", iadc);
> -		if (!ret)
> -			enable_irq_wake(irq_eoc);
> -		else
> +		if (ret)
> +			return ret;
> +
> +		ret = enable_irq_wake(irq_eoc);
> +		if (ret)
> +			return ret;
> +
> +		ret = devm_add_action_or_reset(dev, iadc_disable_irq_wake,
> +					       (void *)(long)irq_eoc);
> +		if (ret)
>  			return ret;
>  	} else {
>  		ret = devm_device_init_wakeup(iadc->dev);