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

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 22 May 2026 15:58:49 +0100
Jonathan Cameron <jic23@kernel.org> wrote:

> On Thu, 21 May 2026 00:09:24 +0500
> Stepan Ionichev <sozdayvek@gmail.com> 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.
> > 
> > Signed-off-by: Stepan Ionichev <sozdayvek@gmail.com>  
> 
> Looks mostly good - one trivial question inline.
> 
> > ---
> >  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 b64a8a407..0ec3a0c4b 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((unsigned long)data);  
> Why not cast it to an int given that's what disable_irq_wake() takes
> 
> > +}
> > +
> >  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 *)(unsigned long)irq_eoc);  
> 
> What is the unsigned long bit of this cast giving us? Just casting to
> void * should be enough I think.
The answer to this was size mismatch - so I was completely wrong ;(

So as I just replied to v2 this was correct, but could do with
a Fixes tag.

Thanks

Jonathan

> 
> 
> > +		if (ret)
> >  			return ret;
> >  	} else {
> >  		ret = devm_device_init_wakeup(iadc->dev);  
> 
>