thermal: core: Store zone trips table in struct thermal_zone_device

The current code expects thermal zone creators to pass a pointer to a
writable trips table to thermal_zone_device_register_with_trips() and
that trips table is then used by the thermal core going forward.

Consequently, the callers of thermal_zone_device_register_with_trips()
are required to hold on to the trips table passed to it until the given
thermal zone is unregistered, at which point the trips table can be
freed, but at the same time they are not expected to access that table
directly.  This is both error prone and confusing.

To address it, turn the trips table pointer in struct thermal_zone_device
into a flex array (counted by its num_trips field), allocate it during
thermal zone device allocation and copy the contents of the trips table
supplied by the zone creator (which can be const now) into it, which
will allow the callers of thermal_zone_device_register_with_trips() to
drop their trip tables right after the zone registration.

This requires the imx thermal driver to be adjusted to store the new
temperature in its internal trips table in imx_set_trip_temp(), because
it will be separate from the core's trips table now and it has to be
explicitly kept in sync with the latter.

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, 2 insertions, 2 deletions

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 4d6c22e0ed85..20fa7d5ac536 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -438,12 +438,10 @@ static int thermal_of_unbind(struct thermal_zone_device *tz,
  */
 static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
 {
-	struct thermal_trip *trips = tz->trips;
 	struct thermal_zone_device_ops *ops = tz->ops;
 
 	thermal_zone_device_disable(tz);
 	thermal_zone_device_unregister(tz);
-	kfree(trips);
 	kfree(ops);
 }
 
@@ -526,6 +524,8 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
 		goto out_kfree_trips;
 	}
 
+	kfree(trips);
+
 	ret = thermal_zone_device_enable(tz);
 	if (ret) {
 		pr_err("Failed to enabled thermal zone '%s', id=%d: %d\n",