Currently, clearing usb port(empty port) PM Qos NO_POWER_OFF flag twice will
lead
the usb port to fall into the infinite loop of runtime pm resume and
suspend. This is caused by pm_request_resume() in the
acpi_power_resume_dependent().
Detail is in the following link.
http://marc.info/?l=linux-acpi&m=138182749202885&w=2
This patchset is to fix the issue. Patch 1~2 adds new state_lock
to mutex power resource's _ON, _OFF and _STA instead of resource_lock
in order to avoid dead lock when call acpi_power_get_inferred_state()
under resource_lock. Prepare for Patch 3.
Patch 3 is to make pm_request_resume() in the acpi_power_resume_dependent()
able to run just after turning on power and check the right physical device
runtime pm status.
Lan Tianyu (3):
ACPI/Power: Add state_lock to mutex power resource's _ON, _OFF and
_STA
ACPI/POWER: Rework acpi_power_get_state()
ACPI/POWER: Call acpi_power_resume_dependent() directly in the
acpi_power_on_unlocked()
drivers/acpi/power.c | 43 ++++++++++++++++++++-----------------------
1 file changed, 20 insertions(+), 23 deletions(-)
--
1.8.2.1
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