thermal: core: Store zone ops in struct thermal_zone_device

The current code requires thermal zone creators to pass pointers to
writable ops structures to thermal_zone_device_register_with_trips()
which needs to modify the target struct thermal_zone_device_ops object
if the "critical" operation in it is NULL.

Moreover, the callers of thermal_zone_device_register_with_trips() are
required to hold on to the struct thermal_zone_device_ops object passed
to it until the given thermal zone is unregistered.

Both of these requirements are quite inconvenient, so modify struct
thermal_zone_device to contain struct thermal_zone_device_ops as field and
make thermal_zone_device_register_with_trips() copy the contents of the
struct thermal_zone_device_ops passed to it via a pointer (which can be
const now) to that field.

Also adjust the code using thermal zone ops accordingly and modify
thermal_of_zone_register() to use a local ops variable during
thermal zone registration so ops do not need to be freed in
thermal_of_zone_unregister() any more.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 572a24f29a10..ec0559e98d6f 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -182,7 +182,7 @@ struct thermal_zone_device {
 	int prev_low_trip;
 	int prev_high_trip;
 	atomic_t need_update;
-	struct thermal_zone_device_ops *ops;
+	struct thermal_zone_device_ops ops;
 	struct thermal_zone_params *tzp;
 	struct thermal_governor *governor;
 	void *governor_data;
@@ -318,14 +318,14 @@ struct thermal_zone_device *thermal_zone_device_register_with_trips(
 					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay);
 
 struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const char *type,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp);
 
 void thermal_zone_device_unregister(struct thermal_zone_device *tz);
@@ -378,7 +378,7 @@ static inline struct thermal_zone_device *thermal_zone_device_register_with_trip
 					const struct thermal_trip *trips,
 					int num_trips, int mask,
 					void *devdata,
-					struct thermal_zone_device_ops *ops,
+					const struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp,
 					int passive_delay, int polling_delay)
 { return ERR_PTR(-ENODEV); }