thermal: core: Increase maximum number of trip points

sumeetpawnikar · rafaeljw · commit 82b1ec794d70 · 2022-09-30T19:50:10.000+02:00
On one of the Chrome system, if we define more than 12 trip points,
probe for thermal sensor fails with
"int3403 thermal: probe of INTC1046:03 failed with error -22"
and throws an error as
"thermal_sys: Error: Incorrect number of thermal trips".

The thermal_zone_device_register() interface needs maximum
number of trip points supported in a zone as an argument.
This number can't exceed THERMAL_MAX_TRIPS, which is currently
set to 12. To address this issue, THERMAL_MAX_TRIPS value
has to be increased.

This interface also has an argument to specify a mask of trips
which are writable. This mask is defined as an int.
This mask sets the ceiling for increasing maximum number of
supported trips. With the current implementation, maximum number
of trips can be supported is 31.

Also, THERMAL_MAX_TRIPS macro is used in one place only.
So, remove THERMAL_MAX_TRIPS macro and compare num_trips
directly with using a macro BITS_PER_TYPE(int)-1.

Signed-off-by: Sumeet Pawnikar &lt;sumeet.r.pawnikar@intel.com&gt;
Reviewed-by: Andy Shevchenko &lt;andriy.shevchenko@linux.intel.com&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
@@ -1192,7 +1192,20 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (num_trips > THERMAL_MAX_TRIPS || num_trips < 0 || mask >> num_trips) {
+	/*
+	 * Max trip count can't exceed 31 as the "mask >> num_trips" condition.
+	 * For example, shifting by 32 will result in compiler warning:
+	 * warning: right shift count >= width of type [-Wshift-count- overflow]
+	 *
+	 * Also "mask >> num_trips" will always be true with 32 bit shift.
+	 * E.g. mask = 0x80000000 for trip id 31 to be RW. Then
+	 * mask >> 32 = 0x80000000
+	 * This will result in failure for the below condition.
+	 *
+	 * Check will be true when the bit 31 of the mask is set.
+	 * 32 bit shift will cause overflow of 4 byte integer.
+	 */
+	if (num_trips > (BITS_PER_TYPE(int) - 1) || num_trips < 0 || mask >> num_trips) {
 		pr_err("Incorrect number of thermal trips\n");
 		return ERR_PTR(-EINVAL);
 	}
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
@@ -17,8 +17,6 @@
 #include <linux/workqueue.h>
 #include <uapi/linux/thermal.h>
 
-#define THERMAL_MAX_TRIPS	12
-
 /* invalid cooling state */
 #define THERMAL_CSTATE_INVALID -1UL
 
