thermal: Fix cdev registration with THERMAL_NO_LIMIT on 64bit

The size of unsigned long varies between 32 and 64 bit systems while
the size of phandle arguments is always 32 bits per parameter.

On 64-bit systems, cooling devices registered via of-thermal apis fail
to bind when the min/max cooling state is specified as
THERMAL_NO_LIMIT (-1UL) as there is a mis-match between the value read
from the device tree (32bit) and the pre-processor define (64bit).

As we're unlikely to need cooling states larger than 32 bits, and for
consistency with the size of phandle arguments, explicitly limit
THERMAL_NO_LIMIT to 32 bits.

Reported-by: Hyungwoo Yang <hwoo.yang@gmail.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

diff --git a/include/dt-bindings/thermal/thermal.h b/include/dt-bindings/thermal/thermal.h
index 59822a9..b5e6b00 100644 (file)
--- a/include/dt-bindings/thermal/thermal.h
+++ b/include/dt-bindings/thermal/thermal.h
@@ -11,7 +11,7 @@
 #define _DT_BINDINGS_THERMAL_THERMAL_H
 
 /* On cooling devices upper and lower limits */
-#define THERMAL_NO_LIMIT               (-1UL)
+#define THERMAL_NO_LIMIT               (~0)
 
 #endif
 

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index ef90838..005586f 100644 (file)
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -38,7 +38,7 @@
 #define THERMAL_CSTATE_INVALID -1UL
 
 /* No upper/lower limit requirement */
-#define THERMAL_NO_LIMIT       THERMAL_CSTATE_INVALID
+#define THERMAL_NO_LIMIT       ((u32)~0)
 
 /* Unit conversion macros */
 #define KELVIN_TO_CELSIUS(t)   (long)(((long)t-2732 >= 0) ?    \