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

[Joshua Crofts]

On Thu, 17 Sep 2026 04:11:28 +0100
Jonathan Cameron <jic23 at kernel.org> wrote:

> On Mon, 14 Sep 2026 14:53:39 +0200
> Joshua Crofts <joshua.crofts1 at gmail.com> wrote:
> 
> > On Mon, 14 Sep 2026 19:34:22 +0800
> > Guangshuo Li <lgs201920130244 at 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 at vger.kernel.org
> > > Signed-off-by: Guangshuo Li <lgs201920130244 at 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 at 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.
> 

FYI, patches like these will become redundant as I have a patch adding
this to pm_runtime_reinit() so driver core calls this automatically on
unbind queued for 7.4 [1].

[1] https://lore.kernel.org/all/20260919-move-dont-use-autosuspend-v1-1-f6e2d1315c23@gmail.com/

-- 
Kind regards,
Joshua Crofts