Re: [PATCH v3 3/4] thermal/core: Build ascending ordered indexes for the trip points

From: Zhang Rui
Date: Mon Jul 18 2022 - 21:15:02 EST


On Mon, 2022-07-18 at 15:21 +0200, Daniel Lezcano wrote:
>
> Hi Zhang,
>
> thanks for the review
>
> On 18/07/2022 07:28, Zhang Rui wrote:
> > On Fri, 2022-07-15 at 23:09 +0200, Daniel Lezcano wrote:
>
> [ ... ]
>
> > > Instead of taking the risk of breaking the existing platforms,
> > > use an
> > > array of temperature ordered trip identifiers and make it
> > > available
> > > for the code needing to browse the trip points in an ordered way.
> > >
> > > Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
> > > ---
>
> [ ... ]
>
> > > +static void sort_trips_indexes(struct thermal_zone_device *tz)
> > > +{
> > > +       int i, j;
> > > +
> > > +       for (i = 0; i < tz->trips; i++)
> > > +               tz->trips_indexes[i] = i;
> > > +
> > > +       for (i = 0; i < tz->trips; i++) {
> > > +               for (j = i + 1; j < tz->trips; j++) {
> > > +                       int t1, t2;
> > > +
> > > +                       tz->ops->get_trip_temp(tz, tz-
> > > > trips_indexes[i], &t1);
> >
> > This line can be moved to the upper loop.
>
> Right, thanks!
>
> > > +                       tz->ops->get_trip_temp(tz, tz-
> > > > trips_indexes[j], &t2);
> > > +
> >
> > what about the disabled trip points?
> >
> > we should ignore those trip points and check the return value to
> > make
> > sure we're comparing the valid trip_temp values.
>
> We don't have to care about, whatever the position, the corresponding
> trip id will be disabled by the trip init function before calling
> this
> one and ignored in the handle_thermal_trip() function

hah, I missed this one and replied to your latest reply directly.

The thing I'm concerning is that if we don't check the return value,
for a disabled trip point, the trip_temp (t1/t2) returned is some
random value, it all depends on the previous value set by last
successful .get_trip_temp(), and this may screw up the sorting.

thanks,
rui
>
>