This is a note to let you know that I've just added the patch titled PM: domains: Fix initialization of genpd's next_wakeup to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pm-domains-fix-initialization-of-genpd-s-next_wakeup.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 8633ab199a901563c79db5ec3a59e0ebb67f2e08 Author: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Date: Wed May 11 16:57:00 2022 +0200 PM: domains: Fix initialization of genpd's next_wakeup [ Upstream commit 622d9b5577f19a6472db21df042fea8f5fefe244 ] In the genpd governor we walk the list of child-domains to take into account their next_wakeup. If the child-domain itself, doesn't have a governor assigned to it, we can end up using the next_wakeup value before it has been properly initialized. To prevent a possible incorrect behaviour in the governor, let's initialize next_wakeup to KTIME_MAX. Fixes: c79aa080fb0f ("PM: domains: use device's next wakeup to determine domain idle state") Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 7e8039d1884c..0f2e42f36851 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -1978,6 +1978,7 @@ int pm_genpd_init(struct generic_pm_domain *genpd, genpd->device_count = 0; genpd->max_off_time_ns = -1; genpd->max_off_time_changed = true; + genpd->next_wakeup = KTIME_MAX; genpd->provider = NULL; genpd->has_provider = false; genpd->accounting_time = ktime_get();