On Wed, Sep 24, 2014 at 10:27:12AM +0200, Lukasz Majewski wrote:
> Without this check it was possible to execute cooling device binding code
> even when wrong max cooling state was read.
>
> Signed-off-by: Lukasz Majewski <[email protected]>
Acked-by: Eduardo Valentin <[email protected]>
Rui, are you taking these patches? Do you prefer me to collect them?
Cheers
Eduardo
> ---
> drivers/thermal/thermal_core.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 747618a..8a4dc35 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -928,7 +928,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
> struct thermal_zone_device *pos1;
> struct thermal_cooling_device *pos2;
> unsigned long max_state = 0;
> - int result;
> + int result, ret;
>
> if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
> return -EINVAL;
> @@ -945,7 +945,9 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
> if (tz != pos1 || cdev != pos2)
> return -EINVAL;
>
> - cdev->ops->get_max_state(cdev, &max_state);
> + ret = cdev->ops->get_max_state(cdev, &max_state);
> + if (ret)
> + return ret;
>
> /* lower default 0, upper default max_state */
> lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
> --
> 2.0.0.rc2
>
Hi Eduardo, Rui,
> On Wed, Sep 24, 2014 at 10:27:12AM +0200, Lukasz Majewski wrote:
> > Without this check it was possible to execute cooling device
> > binding code even when wrong max cooling state was read.
> >
> > Signed-off-by: Lukasz Majewski <[email protected]>
>
> Acked-by: Eduardo Valentin <[email protected]>
>
> Rui, are you taking these patches? Do you prefer me to collect them?
I'd like to ask you NOT to apply those patches.
In short: It will cause regression on all non Exynos boards.
Explanation:
Up till now the cpu_cooling device was bind even when the
get_max_state() returned -EINVAL and everything worked after late
cpufreq policy initialization.
However, during this time window the thermal driver is not properly
configured.
Applying PATCH2/3 and PATCH3/3 would cause bind error without any
further occasion for re-bind. As a result THERAL will not be present
on the target system.
It works on the Exynos boards, since at the report_trigger() function,
when first trip point is reached, it is checked if cpu_cooling device
is bind. If it is not (due to "fixes" at PATCH2/3 and PATCH3/3) it
is rebind then.
Due to above, I think that it would be best to leave things as they are
now and prepare proper fix as suggested by Eduardo.
>
> Cheers
>
> Eduardo
>
> > ---
> > drivers/thermal/thermal_core.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/thermal/thermal_core.c
> > b/drivers/thermal/thermal_core.c index 747618a..8a4dc35 100644
> > --- a/drivers/thermal/thermal_core.c
> > +++ b/drivers/thermal/thermal_core.c
> > @@ -928,7 +928,7 @@ int thermal_zone_bind_cooling_device(struct
> > thermal_zone_device *tz, struct thermal_zone_device *pos1;
> > struct thermal_cooling_device *pos2;
> > unsigned long max_state = 0;
> > - int result;
> > + int result, ret;
> >
> > if (trip >= tz->trips || (trip < 0 && trip !=
> > THERMAL_TRIPS_NONE)) return -EINVAL;
> > @@ -945,7 +945,9 @@ int thermal_zone_bind_cooling_device(struct
> > thermal_zone_device *tz, if (tz != pos1 || cdev != pos2)
> > return -EINVAL;
> >
> > - cdev->ops->get_max_state(cdev, &max_state);
> > + ret = cdev->ops->get_max_state(cdev, &max_state);
> > + if (ret)
> > + return ret;
> >
> > /* lower default 0, upper default max_state */
> > lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
> > --
> > 2.0.0.rc2
> >
--
Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
On Fri, 2014-10-03 at 12:40 +0200, Lukasz Majewski wrote:
> Hi Eduardo, Rui,
>
> > On Wed, Sep 24, 2014 at 10:27:12AM +0200, Lukasz Majewski wrote:
> > > Without this check it was possible to execute cooling device
> > > binding code even when wrong max cooling state was read.
> > >
> > > Signed-off-by: Lukasz Majewski <[email protected]>
> >
> > Acked-by: Eduardo Valentin <[email protected]>
> >
> > Rui, are you taking these patches? Do you prefer me to collect them?
>
> I'd like to ask you NOT to apply those patches.
>
> In short: It will cause regression on all non Exynos boards.
>
> Explanation:
>
> Up till now the cpu_cooling device was bind even when the
> get_max_state() returned -EINVAL and everything worked after late
> cpufreq policy initialization.
>
> However, during this time window the thermal driver is not properly
> configured.
>
> Applying PATCH2/3 and PATCH3/3 would cause bind error without any
> further occasion for re-bind. As a result THERAL will not be present
> on the target system.
>
> It works on the Exynos boards, since at the report_trigger() function,
> when first trip point is reached, it is checked if cpu_cooling device
> is bind. If it is not (due to "fixes" at PATCH2/3 and PATCH3/3) it
> is rebind then.
>
> Due to above, I think that it would be best to leave things as they are
> now and prepare proper fix as suggested by Eduardo.
>
Agreed. Can anyone please propose such a patch?
thanks,
rui
> >
> > Cheers
> >
> > Eduardo
> >
> > > ---
> > > drivers/thermal/thermal_core.c | 6 ++++--
> > > 1 file changed, 4 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/thermal/thermal_core.c
> > > b/drivers/thermal/thermal_core.c index 747618a..8a4dc35 100644
> > > --- a/drivers/thermal/thermal_core.c
> > > +++ b/drivers/thermal/thermal_core.c
> > > @@ -928,7 +928,7 @@ int thermal_zone_bind_cooling_device(struct
> > > thermal_zone_device *tz, struct thermal_zone_device *pos1;
> > > struct thermal_cooling_device *pos2;
> > > unsigned long max_state = 0;
> > > - int result;
> > > + int result, ret;
> > >
> > > if (trip >= tz->trips || (trip < 0 && trip !=
> > > THERMAL_TRIPS_NONE)) return -EINVAL;
> > > @@ -945,7 +945,9 @@ int thermal_zone_bind_cooling_device(struct
> > > thermal_zone_device *tz, if (tz != pos1 || cdev != pos2)
> > > return -EINVAL;
> > >
> > > - cdev->ops->get_max_state(cdev, &max_state);
> > > + ret = cdev->ops->get_max_state(cdev, &max_state);
> > > + if (ret)
> > > + return ret;
> > >
> > > /* lower default 0, upper default max_state */
> > > lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
> > > --
> > > 2.0.0.rc2
> > >
>
>
>
Hi Zhang,
> On Fri, 2014-10-03 at 12:40 +0200, Lukasz Majewski wrote:
> > Hi Eduardo, Rui,
> >
> > > On Wed, Sep 24, 2014 at 10:27:12AM +0200, Lukasz Majewski wrote:
> > > > Without this check it was possible to execute cooling device
> > > > binding code even when wrong max cooling state was read.
> > > >
> > > > Signed-off-by: Lukasz Majewski <[email protected]>
> > >
> > > Acked-by: Eduardo Valentin <[email protected]>
> > >
> > > Rui, are you taking these patches? Do you prefer me to collect
> > > them?
> >
> > I'd like to ask you NOT to apply those patches.
> >
> > In short: It will cause regression on all non Exynos boards.
> >
> > Explanation:
> >
> > Up till now the cpu_cooling device was bind even when the
> > get_max_state() returned -EINVAL and everything worked after late
> > cpufreq policy initialization.
> >
> > However, during this time window the thermal driver is not properly
> > configured.
> >
> > Applying PATCH2/3 and PATCH3/3 would cause bind error without any
> > further occasion for re-bind. As a result THERAL will not be present
> > on the target system.
> >
> > It works on the Exynos boards, since at the report_trigger()
> > function, when first trip point is reached, it is checked if
> > cpu_cooling device is bind. If it is not (due to "fixes" at
> > PATCH2/3 and PATCH3/3) it is rebind then.
> >
> > Due to above, I think that it would be best to leave things as they
> > are now and prepare proper fix as suggested by Eduardo.
> >
> Agreed. Can anyone please propose such a patch?
I can propose myself as a volunteer for this. Unfortunately, I won't be
able to provide any code earlier than in two weeks time.
>
> thanks,
> rui
> > >
> > > Cheers
> > >
> > > Eduardo
> > >
> > > > ---
> > > > drivers/thermal/thermal_core.c | 6 ++++--
> > > > 1 file changed, 4 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/drivers/thermal/thermal_core.c
> > > > b/drivers/thermal/thermal_core.c index 747618a..8a4dc35 100644
> > > > --- a/drivers/thermal/thermal_core.c
> > > > +++ b/drivers/thermal/thermal_core.c
> > > > @@ -928,7 +928,7 @@ int thermal_zone_bind_cooling_device(struct
> > > > thermal_zone_device *tz, struct thermal_zone_device *pos1;
> > > > struct thermal_cooling_device *pos2;
> > > > unsigned long max_state = 0;
> > > > - int result;
> > > > + int result, ret;
> > > >
> > > > if (trip >= tz->trips || (trip < 0 && trip !=
> > > > THERMAL_TRIPS_NONE)) return -EINVAL;
> > > > @@ -945,7 +945,9 @@ int thermal_zone_bind_cooling_device(struct
> > > > thermal_zone_device *tz, if (tz != pos1 || cdev != pos2)
> > > > return -EINVAL;
> > > >
> > > > - cdev->ops->get_max_state(cdev, &max_state);
> > > > + ret = cdev->ops->get_max_state(cdev, &max_state);
> > > > + if (ret)
> > > > + return ret;
> > > >
> > > > /* lower default 0, upper default max_state */
> > > > lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
> > > > --
> > > > 2.0.0.rc2
> > > >
> >
> >
> >
>
--
Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group