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thermal: gov_power_allocator: Add missing NULL pointer check

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Commit 0dc23567c2 ("thermal: core: Move lists of thermal instances
to trip descriptors") overlooked the case in which the Power Allocator
governor attempts to bind to a tripless thermal zone and params->trip_max
is NULL in check_power_actors().

No power actors can be found in that case, so check_power_actors() needs
to be made return 0 then to restore its previous behavior.

Fixes: 0dc23567c2 ("thermal: core: Move lists of thermal instances to trip descriptors")
Closes: https://lore.kernel.org/linux-pm/Z0NeGF4ryCe_b5rr@sashalap/
Reported-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/2761105.mvXUDI8C0e@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki 2024-11-25 12:24:46 +01:00
parent eb78332b10
commit ac1f43c03f
1 changed files with 6 additions and 1 deletions
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7
drivers/thermal/gov_power_allocator.c
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@ -588,10 +588,15 @@ static void allow_maximum_power(struct thermal_zone_device *tz)
static int check_power_actors(struct thermal_zone_device *tz,
struct power_allocator_params *params)
{
const struct thermal_trip_desc *td = trip_to_trip_desc(params->trip_max);
const struct thermal_trip_desc *td;
struct thermal_instance *instance;
int ret = 0;
if (!params->trip_max)
return 0;
td = trip_to_trip_desc(params->trip_max);
list_for_each_entry(instance, &td->thermal_instances, trip_node) {
if (!cdev_is_power_actor(instance->cdev)) {
dev_warn(&tz->device, "power_allocator: %s is not a power actor\n",