From 670a5e356cb6dfc61b87b599eba483af6a3a99ad Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Fri, 5 Aug 2022 17:38:33 +0200 Subject: [PATCH] thermal/core: Move the thermal zone lock out of the governors All the governors throttling ops are taking/releasing the lock at the beginning and the end of the function. We can move the mutex to the throttling call site instead. Signed-off-by: Daniel Lezcano Link: https://lore.kernel.org/r/20220805153834.2510142-4-daniel.lezcano@linaro.org --- drivers/thermal/gov_bang_bang.c | 4 +--- drivers/thermal/gov_fair_share.c | 4 +--- drivers/thermal/gov_power_allocator.c | 16 ++++++---------- drivers/thermal/gov_step_wise.c | 4 +--- drivers/thermal/thermal_core.c | 2 ++ 5 files changed, 11 insertions(+), 19 deletions(-) diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c index f0bff2e0475b1..a08bbe33be967 100644 --- a/drivers/thermal/gov_bang_bang.c +++ b/drivers/thermal/gov_bang_bang.c @@ -96,15 +96,13 @@ static int bang_bang_control(struct thermal_zone_device *tz, int trip) { struct thermal_instance *instance; - mutex_lock(&tz->lock); + lockdep_assert_held(&tz->lock); thermal_zone_trip_update(tz, trip); list_for_each_entry(instance, &tz->thermal_instances, tz_node) thermal_cdev_update(instance->cdev); - mutex_unlock(&tz->lock); - return 0; } diff --git a/drivers/thermal/gov_fair_share.c b/drivers/thermal/gov_fair_share.c index 5d5ddd648cd26..a4ee4661e9cc4 100644 --- a/drivers/thermal/gov_fair_share.c +++ b/drivers/thermal/gov_fair_share.c @@ -82,7 +82,7 @@ static int fair_share_throttle(struct thermal_zone_device *tz, int trip) int total_instance = 0; int cur_trip_level = get_trip_level(tz); - mutex_lock(&tz->lock); + lockdep_assert_held(&tz->lock); list_for_each_entry(instance, &tz->thermal_instances, tz_node) { if (instance->trip != trip) @@ -112,8 +112,6 @@ static int fair_share_throttle(struct thermal_zone_device *tz, int trip) mutex_unlock(&cdev->lock); } - mutex_unlock(&tz->lock); - return 0; } diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c index d3aca236e2746..2d1aeaba38a88 100644 --- a/drivers/thermal/gov_power_allocator.c +++ b/drivers/thermal/gov_power_allocator.c @@ -697,19 +697,19 @@ static void power_allocator_unbind(struct thermal_zone_device *tz) static int power_allocator_throttle(struct thermal_zone_device *tz, int trip) { - int ret = 0; + int ret; int switch_on_temp, control_temp; struct power_allocator_params *params = tz->governor_data; bool update; - mutex_lock(&tz->lock); + lockdep_assert_held(&tz->lock); /* * We get called for every trip point but we only need to do * our calculations once */ if (trip != params->trip_max_desired_temperature) - goto out; + return 0; ret = tz->ops->get_trip_temp(tz, params->trip_switch_on, &switch_on_temp); @@ -718,7 +718,7 @@ static int power_allocator_throttle(struct thermal_zone_device *tz, int trip) tz->passive = 0; reset_pid_controller(params); allow_maximum_power(tz, update); - goto out; + return 0; } tz->passive = 1; @@ -729,14 +729,10 @@ static int power_allocator_throttle(struct thermal_zone_device *tz, int trip) dev_warn(&tz->device, "Failed to get the maximum desired temperature: %d\n", ret); - goto out; + return ret; } - ret = allocate_power(tz, control_temp); - - mutex_unlock(&tz->lock); -out: - return ret; + return allocate_power(tz, control_temp); } static struct thermal_governor thermal_gov_power_allocator = { diff --git a/drivers/thermal/gov_step_wise.c b/drivers/thermal/gov_step_wise.c index 597a0ebec7a4f..cdd3354bc27fe 100644 --- a/drivers/thermal/gov_step_wise.c +++ b/drivers/thermal/gov_step_wise.c @@ -160,15 +160,13 @@ static int step_wise_throttle(struct thermal_zone_device *tz, int trip) { struct thermal_instance *instance; - mutex_lock(&tz->lock); + lockdep_assert_held(&tz->lock); thermal_zone_trip_update(tz, trip); list_for_each_entry(instance, &tz->thermal_instances, tz_node) thermal_cdev_update(instance->cdev); - mutex_unlock(&tz->lock); - return 0; } diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 5408e92a11685..fcac28d28739f 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -311,8 +311,10 @@ static void monitor_thermal_zone(struct thermal_zone_device *tz) static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip) { + mutex_lock(&tz->lock); tz->governor ? tz->governor->throttle(tz, trip) : def_governor->throttle(tz, trip); + mutex_unlock(&tz->lock); } void thermal_zone_device_critical(struct thermal_zone_device *tz) -- 2.30.2