6.11-stable review patch. If anyone has any objections, please let me know.
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From: Rafael J. Wysocki rafael.j.wysocki@intel.com
[ Upstream commit cdf771ab476bd9acb0948f3088a277d5c3cacc6b ]
If the registration of a thermal zone takes place at the time when system suspend is started, thermal_pm_notify() can run before the new thermal zone is added to thermal_tz_list and its "suspended" flag will not be set. Consequently, if __thermal_zone_device_update() is called for that thermal zone, it will not return early as expected which may cause some destructive interference with the system suspend or resume flow to occur.
To avoid that, make thermal_zone_init_complete() introduced previously set the "suspended" flag for new thermal zones if it runs during system suspend or resume.
Fixes: 4e814173a8c4 ("thermal: core: Fix thermal zone suspend-resume synchronization") Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Link: https://patch.msgid.link/8490245.NyiUUSuA9g@rjwysocki.net Reviewed-by: Lukasz Luba lukasz.luba@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/thermal/thermal_core.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 91512a8cb49d9..a674469adad19 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -40,6 +40,8 @@ static DEFINE_MUTEX(thermal_governor_lock);
static struct thermal_governor *def_governor;
+static bool thermal_pm_suspended; + /* * Governor section: set of functions to handle thermal governors * @@ -1356,6 +1358,14 @@ static void thermal_zone_init_complete(struct thermal_zone_device *tz) mutex_lock(&tz->lock);
tz->state &= ~TZ_STATE_FLAG_INIT; + /* + * If system suspend or resume is in progress at this point, the + * new thermal zone needs to be marked as suspended because + * thermal_pm_notify() has run already. + */ + if (thermal_pm_suspended) + tz->state |= TZ_STATE_FLAG_SUSPENDED; + __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
mutex_unlock(&tz->lock); @@ -1544,10 +1554,10 @@ thermal_zone_device_register_with_trips(const char *type, } }
- mutex_unlock(&thermal_list_lock); - thermal_zone_init_complete(tz);
+ mutex_unlock(&thermal_list_lock); + thermal_notify_tz_create(tz);
thermal_debug_tz_add(tz); @@ -1768,6 +1778,8 @@ static int thermal_pm_notify(struct notifier_block *nb, case PM_SUSPEND_PREPARE: mutex_lock(&thermal_list_lock);
+ thermal_pm_suspended = true; + list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_pm_prepare(tz);
@@ -1778,6 +1790,8 @@ static int thermal_pm_notify(struct notifier_block *nb, case PM_POST_SUSPEND: mutex_lock(&thermal_list_lock);
+ thermal_pm_suspended = false; + list_for_each_entry(tz, &thermal_tz_list, node) thermal_zone_pm_complete(tz);