diff options
Diffstat (limited to 'drivers/thermal/thermal_core.c')
| -rw-r--r-- | drivers/thermal/thermal_core.c | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 30567b499455..1b0ab2790860 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -999,9 +999,17 @@ __thermal_cooling_device_register(struct device_node *np, if (ret) goto out_cdev_type; + /* + * The cooling device's current state is only needed for debug + * initialization below, so a failure to get it does not cause + * the entire cooling device initialization to fail. However, + * the debug will not work for the device if its initial state + * cannot be determined and drivers are responsible for ensuring + * that this will not happen. + */ ret = cdev->ops->get_cur_state(cdev, ¤t_state); if (ret) - goto out_cdev_type; + current_state = ULONG_MAX; thermal_cooling_device_setup_sysfs(cdev); @@ -1016,7 +1024,8 @@ __thermal_cooling_device_register(struct device_node *np, return ERR_PTR(ret); } - thermal_debug_cdev_add(cdev, current_state); + if (current_state <= cdev->max_state) + thermal_debug_cdev_add(cdev, current_state); /* Add 'this' new cdev to the global cdev list */ mutex_lock(&thermal_list_lock); @@ -1397,6 +1406,7 @@ thermal_zone_device_register_with_trips(const char *type, ida_init(&tz->ida); mutex_init(&tz->lock); init_completion(&tz->removal); + init_completion(&tz->resume); id = ida_alloc(&thermal_tz_ida, GFP_KERNEL); if (id < 0) { result = id; @@ -1642,6 +1652,9 @@ static void thermal_zone_device_resume(struct work_struct *work) thermal_zone_device_init(tz); __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); + complete(&tz->resume); + tz->resuming = false; + mutex_unlock(&tz->lock); } @@ -1659,6 +1672,20 @@ static int thermal_pm_notify(struct notifier_block *nb, list_for_each_entry(tz, &thermal_tz_list, node) { mutex_lock(&tz->lock); + if (tz->resuming) { + /* + * thermal_zone_device_resume() queued up for + * this zone has not acquired the lock yet, so + * release it to let the function run and wait + * util it has done the work. + */ + mutex_unlock(&tz->lock); + + wait_for_completion(&tz->resume); + + mutex_lock(&tz->lock); + } + tz->suspended = true; mutex_unlock(&tz->lock); @@ -1676,6 +1703,9 @@ static int thermal_pm_notify(struct notifier_block *nb, cancel_delayed_work(&tz->poll_queue); + reinit_completion(&tz->resume); + tz->resuming = true; + /* * Replace the work function with the resume one, which * will restore the original work function and schedule @@ -1700,6 +1730,12 @@ static int thermal_pm_notify(struct notifier_block *nb, static struct notifier_block thermal_pm_nb = { .notifier_call = thermal_pm_notify, + /* + * Run at the lowest priority to avoid interference between the thermal + * zone resume work items spawned by thermal_pm_notify() and the other + * PM notifiers. + */ + .priority = INT_MIN, }; static int __init thermal_init(void) |