Re: [PATCH] thermal: fix the casting issue for long type

[Leo Yan <leo.yan@linaro.org>]

hi Punit,

On Thu, Feb 26, 2015 at 10:24:30AM +0000, Punit Agrawal wrote:
> Hi Leo,
> 
> Leo Yan <leo.yan@linaro.org> writes:
> 
> > When enable the thermal on arm64 platform, it will report failure when
> > call function *thermal_zone_bind_cooling_device()*.
> >
> > The failure is caused by casting. If dtb specify the minimum cooling
> > state and maximum cooling state as THERMAL_NO_LIMIT, then variables
> > "lower" and "upper" equal to 0x0000_0000_ffff_fffff after casting the
> > value from "unsigned int" to "unsigned long".
> >
> > Finally in kernel if check the variables "lower" and "upper", it will
> > never equal to (-1UL), or 0xffff_ffff_ffff_fffff.
> >
> > So change to use "unsigned int" type, this can be compatible for 32 bits
> > and 64 bits system.
> >
> > Signed-off-by: Leo Yan <leo.yan@linaro.org>
> 
> There's already a fix for this issue that made it to v3.19 (Commit
> id a940cb34fed7). Does that not work for you?
> 
I worked on 3.18, so this patch has been missed. Thanks for pointing
out, i will back port this patch.

> Cheers,
> Punit
> 
> > ---
> >  drivers/thermal/of-thermal.c   | 4 ++--
> >  drivers/thermal/thermal_core.c | 6 +++---
> >  include/linux/thermal.h        | 2 +-
> >  3 files changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> > index 668fb1b..b50c4e1 100644
> > --- a/drivers/thermal/of-thermal.c
> > +++ b/drivers/thermal/of-thermal.c
> > @@ -49,8 +49,8 @@ struct __thermal_bind_params {
> >  	struct device_node *cooling_device;
> >  	unsigned int trip_id;
> >  	unsigned int usage;
> > -	unsigned long min;
> > -	unsigned long max;
> > +	unsigned int min;
> > +	unsigned int max;
> >  };
> >  
> >  /**
> > diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> > index 48491d1..04de575 100644
> > --- a/drivers/thermal/thermal_core.c
> > +++ b/drivers/thermal/thermal_core.c
> > @@ -923,7 +923,7 @@ thermal_cooling_device_trip_point_show(struct device *dev,
> >  int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
> >  				     int trip,
> >  				     struct thermal_cooling_device *cdev,
> > -				     unsigned long upper, unsigned long lower)
> > +				     unsigned int upper, unsigned int lower)
> >  {
> >  	struct thermal_instance *dev;
> >  	struct thermal_instance *pos;
> > @@ -952,8 +952,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
> >  		return ret;
> >  
> >  	/* lower default 0, upper default max_state */
> > -	lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
> > -	upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
> > +	lower = lower == (unsigned int)THERMAL_NO_LIMIT ? 0 : lower;
> > +	upper = upper == (unsigned int)THERMAL_NO_LIMIT ? max_state : upper;
> >  
> >  	if (lower > upper || upper > max_state)
> >  		return -EINVAL;
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index fc52e30..a2afe04 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -321,7 +321,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *);
> >  
> >  int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
> >  				     struct thermal_cooling_device *,
> > -				     unsigned long, unsigned long);
> > +				     unsigned int, unsigned int);
> >  int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
> >  				       struct thermal_cooling_device *);
> >  void thermal_zone_device_update(struct thermal_zone_device *);