Rafael J. Wysocki 36003d4cf5 driver core: Fix PM-runtime for links added during consumer probe ... Commit 4c06c4e6cf ("driver core: Fix possible supplier PM-usage counter imbalance") introduced a regression that causes suppliers to be suspended prematurely for device links added during consumer driver probe if the initial PM-runtime status of the consumer is "suspended" and the consumer is resumed after adding the link and before pm_runtime_put_suppliers() is called. In that case, pm_runtime_put_suppliers() will drop the rpm_active refcount for the link by one and (since rpm_active is equal to two after the preceding consumer resume) the supplier's PM-runtime usage counter will be decremented, which may cause the supplier to suspend even though the consumer's PM-runtime status is "active". For this reason, partially revert commit 4c06c4e6cf as the problem it tried to fix needs to be addressed somewhat differently, and change pm_runtime_get_suppliers() and pm_runtime_put_suppliers() so that the latter only drops rpm_active references acquired by the former. [This requires adding a new field to struct device_link, but I coulnd't find a cleaner way to address the issue that would work in all cases.] This causes pm_runtime_put_suppliers() to effectively ignore device links added during consumer probe, so device_link_add() doesn't need to worry about ensuring that suppliers will remain active after pm_runtime_put_suppliers() for links created with DL_FLAG_RPM_ACTIVE set and it only needs to bump up rpm_active by one for those links, so pm_runtime_active_link() is not necessary any more. Fixes: 4c06c4e6cf ("driver core: Fix possible supplier PM-usage counter imbalance") Reported-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-02-20 11:18:07 +01:00
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clock_ops.c	PM / clk: signedness bug in of_pm_clk_add_clks()	2018-08-24 11:52:34 +02:00
common.c	PM / Domains: Introduce dev_pm_domain_attach_by_name()	2018-07-09 12:11:02 +02:00
domain_governor.c	PM / QoS: Fix device resume latency framework	2017-11-08 12:14:51 +01:00
domain.c	Merge branches 'pm-core', 'pm-qos', 'pm-domains' and 'pm-sleep'	2018-12-21 10:06:44 +01:00
generic_ops.c	PM / sleep: Remove pm_complete_with_resume_check()	2017-10-11 15:40:29 +02:00
main.c	PM core: Use new async_schedule_dev command	2019-01-31 14:20:54 +01:00
Makefile	Merge branches 'pm-cpufreq-sched' and 'pm-opp'	2017-11-13 01:40:52 +01:00
power.h	PM / core: Drop unused internal inline functions for sysfs	2018-05-10 11:55:12 +02:00
qos.c	PM / QoS: Fix device resume latency framework	2017-11-08 12:14:51 +01:00
runtime.c	driver core: Fix PM-runtime for links added during consumer probe	2019-02-20 11:18:07 +01:00
sysfs.c	PM / wakeup: Export wakeup_count instead of event_count via sysfs	2018-06-06 09:23:36 +02:00
trace.c	PM: Switch to use %ptR	2018-12-10 22:40:18 +01:00
wakeirq.c	PM / wakeirq: Add wakeup name to dedicated wake irqs	2018-02-26 23:23:37 +01:00
wakeup.c	Merge branches 'pm-pci', 'acpi-pm', 'pm-sleep' and 'pm-avs'	2018-06-04 10:41:53 +02:00