Re: [PATCH] iio: adc: at91-sama5d2: disable autosuspend on remove

[Jonathan Cameron <jic23@kernel.org>]

On Mon, 14 Sep 2026 14:53:39 +0200
Joshua Crofts <joshua.crofts1@gmail.com> wrote:

> On Mon, 14 Sep 2026 19:34:22 +0800
> Guangshuo Li <lgs201920130244@gmail.com> wrote:
> 
> > at91_adc_probe() enables runtime PM autosuspend with
> > pm_runtime_use_autosuspend(). The probe error path correctly undoes
> > this setting with pm_runtime_dont_use_autosuspend(), but the normal
> > remove path only disables runtime PM.
> > 
> > The runtime PM API requires pm_runtime_use_autosuspend() to be undone
> > with pm_runtime_dont_use_autosuspend() at driver exit unless runtime PM
> > was enabled with devm_pm_runtime_enable(). Leaving the autosuspend flag
> > set therefore leaves the runtime PM state incompletely cleaned up after
> > the driver is unbound.
> > 
> > Add the missing pm_runtime_dont_use_autosuspend() call to the remove
> > path.
> > 
> > This issue was found by manual code inspection.
> > 
> > Fixes: 75d7556ac0e4 ("iio: adc: at91-sama5d2_adc: add runtime pm support")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
> > ---
> >  drivers/iio/adc/at91-sama5d2_adc.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> > index e8a5285bb6d4..e68632e628c7 100644
> > --- a/drivers/iio/adc/at91-sama5d2_adc.c
> > +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> > @@ -2487,6 +2487,7 @@ static void at91_adc_remove(struct platform_device *pdev)
> >  
> >  	pm_runtime_disable(st->dev);
> >  	pm_runtime_set_suspended(st->dev);
> > +	pm_runtime_dont_use_autosuspend(st->dev);
> >  	clk_disable_unprepare(st->per_clk);
> >  
> >  	regulator_disable(st->vref);  
> 
> Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Applied.

Please make sure to take into account both Joshua and Krzystof's
feedback that multiple near identical changes to drivers in the
same subsystem should be in a series.

Thanks,

Jonathan

>