Re: [PATCH] staging: iio: ad5933: rework probe to use devm_ function variants

[Dan Carpenter]

On Sat, May 02, 2020 at 07:25:42PM +0100, Jonathan Cameron wrote:
> On Tue, 28 Apr 2020 12:31:28 +0300
> Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote:
> > +static void ad5933_cleanup(void *data)
> > +{
> > +	struct ad5933_state *st = data;
> > +
> > +	clk_disable_unprepare(st->mclk);
> > +	regulator_disable(st->reg);
> 
> Please do two separate callbacks so that these can be handled
> in the correct places.  I.e. you do something then immediately
> register the handler to undo it.
> 
> Currently you can end up disabling a clock you haven't enabled
> (which I am fairly sure will give you an error message).

Yeah.  It does.

It feels like we should just make a devm_ version of regulator_enable().
Or potentially this is more complicated than it seems, but in that case
probably adding devm_add_action_or_reset() is more complicated than it
seems as well.

regards,
dan carpenter