Re: [PATCH v4 2/7] pinctrl: qcom: Use return value from irq_set_wake call

[Doug Anderson <dianders@chromium.org>]

Hi,

On Tue, Aug 11, 2020 at 12:34 PM Stephen Boyd <swboyd@chromium.org> wrote:
>
> Quoting Maulik Shah (2020-08-10 04:20:55)
> > msmgpio irqchip is not using return value of irq_set_wake call.
> > Start using it.
>
> Does this work when the irq parent isn't setup in a hierarchy? I seem to
> recall that this was written this way because sometimes
> irq_set_irq_wake() would fail for the summary irq so it was a best
> effort setting of wake on the summary line.
>
> >
> > Fixes: e35a6ae0eb3a ("pinctrl/msm: Setup GPIO chip in hierarchy")
> > Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> > Reviewed-by: Douglas Anderson <dianders@chromium.org>
> > ---
> >  drivers/pinctrl/qcom/pinctrl-msm.c | 8 +++-----
> >  1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> > index 90edf61..c264561 100644
> > --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> > +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> > @@ -1077,12 +1077,10 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
> >          * when TLMM is powered on. To allow that, enable the GPIO
> >          * summary line to be wakeup capable at GIC.
> >          */
> > -       if (d->parent_data)
> > -               irq_chip_set_wake_parent(d, on);
> > -
> > -       irq_set_irq_wake(pctrl->irq, on);
> > +       if (d->parent_data && test_bit(d->hwirq, pctrl->skip_wake_irqs))
> > +               return irq_chip_set_wake_parent(d, on);
>
> So this bit is probably fine.
>
> >
> > -       return 0;
> > +       return irq_set_irq_wake(pctrl->irq, on);
>
> But this one is probably not fine.

Interesting.  I wasn't aware of the history and thus assumed this was
a bug.  If Stephen is remembering correctly, please add a comment
saying that we are purposely ignoring the return value in this case.

-Doug