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After commit5a5efdaffd("thermal: core: Resume thermal zones asynchronously") it is theoretically possible that, if a system suspend starts immediately after a system resume, thermal_zone_device_resume() spawned by the thermal PM notifier for one of the thermal zones at the end of the system resume will run after the PM thermal notifier for the suspend-prepare action. If that happens, tz->suspended set by the latter will be reset by the former which may lead to unexpected consequences. To avoid that race, synchronize thermal_zone_device_resume() with the suspend-prepare thermal PM notifier with the help of additional bool field and completion in struct thermal_zone_device. Note that this also ensures running __thermal_zone_device_update() at least once for each thermal zone between system resume and the following system suspend in case it is needed to start thermal mitigation. Fixes:5a5efdaffd("thermal: core: Resume thermal zones asynchronously") Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linux kernel
============
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