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3e384ee6c6
linux_dsm_epyc7002/drivers/acpi
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Rafael J. Wysocki 3e384ee6c6 ACPI / PM: Fix reference counting of power resources 
The reference counting of ACPI power resources is currently broken
for a few reasons.  First, instead of using a simple reference
counter per power resource it uses a list of objects representing
refereces to the given power resource from devices.  This leads to
the second breakage, because it prevents power resources from
being referenced more than once by one device, which is necessary
if the device is configured to signal wakeup.  Namely, when putting
the device into a low power state we first call
acpi_enable_wakeup_device_power() that should reference count power
resources needed for signaling wakeup and then we call
acpi_power_transition() to power off the device.  The latter call
drops references to the device's power resources, possibly including
the ones added by acpi_enable_wakeup_device_power(), so the device
can't signal wakeup as a result.  Apart from this, the locking
in acpi_power_on() and acpi_power_off_device() doesn't prevent
all possible races from happening, which may be problematic for
runtime PM and asynchronous suspend and resume.

Fix the problem by using a counter for power resources reference
counting and putting the evaluation of ACPI _ON and _OFF methods
under the power resource mutex.

Reported-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
2010-10-23 01:56:14 -04:00
..
acpica Merge branches 'apei', 'battery-mwh-fix', 'bugzilla-10807', 'bugzilla-14736', 'bugzilla-14679', 'bugzilla-16396', 'launchpad-613381' and 'misc' into release 2010-09-29 15:18:28 -04:00
apei Merge branches 'apei', 'battery-mwh-fix', 'bugzilla-10807', 'bugzilla-14736', 'bugzilla-14679', 'bugzilla-16396', 'launchpad-613381' and 'misc' into release 2010-09-29 15:18:28 -04:00
ac.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
acpi_memhotplug.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
acpi_pad.c ACPI: acpi_pad: simplify code to avoid false gcc build warning 2010-09-29 14:08:10 -04:00
atomicio.c ACPI, APEI, Fix acpi_pre_map() return value 2010-09-29 14:02:16 -04:00
battery.c ACPI: Don't report current_now if battery reports in mWh 2010-08-31 00:00:47 -04:00
blacklist.c Merge branch 'msi-dmi' into release 2010-10-08 22:37:46 -04:00
bus.c Merge branches 'apei', 'battery-mwh-fix', 'bugzilla-10807', 'bugzilla-14736', 'bugzilla-14679', 'bugzilla-16396', 'launchpad-613381' and 'misc' into release 2010-09-29 15:18:28 -04:00
button.c ACPICA: Remove wakeup GPE reference counting which is not used 2010-07-06 22:34:26 -04:00
cm_sbs.c ACPI: Move definition of PREFIX from acpi_bus.h to internal..h 2009-08-28 19:57:27 -04:00
container.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
debugfs.c ACPI: introduce module parameter acpi.aml_debug_output 2010-08-14 23:02:14 -04:00
dock.c Merge branches 'battery', 'bugzilla-14667', 'bugzilla-15096', 'bugzilla-15480', 'bugzilla-15521', 'bugzilla-15605', 'gpe-reference-counters', 'misc', 'pxm-fix' and 'video-random-key' into release 2010-04-06 17:06:22 -04:00
ec_sys.c acpi ec_sys: Be more cautious about ec write access 2010-08-03 09:49:13 -04:00
ec.c Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-08-07 17:08:30 -07:00
event.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
fan.c ACPI: fan: Fix more unbalanced code block 2010-09-29 14:08:10 -04:00
glue.c ACPI: Add the check of ADR flag in course of finding ACPI handle for PCI device 2010-07-26 22:32:13 -04:00
hed.c ACPI Hardware Error Device (PNP0C33) support 2010-05-19 22:40:24 -04:00
internal.h Merge branch 'linus' into release 2010-08-15 01:06:31 -04:00
Kconfig ACPI: Kconfig: fix typo. 2010-09-28 21:38:20 -04:00
Makefile Merge branch 'linus' into release 2010-08-15 01:06:31 -04:00
numa.c gcc-4.6: ACPI: fix unused but set variables in ACPI 2010-08-15 00:53:08 -04:00
osl.c Merge branch 'linus' into release 2010-08-15 01:06:31 -04:00
pci_bind.c PCI / ACPI / PM: Platform support for PCI PME wake-up 2010-02-22 16:21:02 -08:00
pci_irq.c x86, acpi/irq: pci device dev->irq is an isa irq not a gsi 2010-05-04 13:34:30 -07:00
pci_link.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
pci_root.c PCI: PCIe: Ask BIOS for control of all native services at once 2010-08-24 13:47:33 -07:00
pci_slot.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
power_meter.c power_meter: acpi_device_class "power_meter_resource" too long 2010-05-06 02:38:24 -04:00
power.c ACPI / PM: Fix reference counting of power resources 2010-10-23 01:56:14 -04:00
proc.c ACPI: remove deprecated ACPI procfs I/F 2010-08-15 00:27:51 -04:00
processor_core.c Merge branch 'pdc-regression' into release 2010-10-08 22:35:02 -04:00
processor_driver.c acpi_idle: add missing \n to printk 2010-09-28 23:30:40 -04:00
processor_idle.c Merge branch 'linus' into release 2010-08-15 01:06:31 -04:00
processor_perflib.c ACPI: Fix typos 2010-09-28 21:38:19 -04:00
processor_thermal.c ACPI processor: remove deprecated ACPI procfs I/F 2010-08-15 00:31:45 -04:00
processor_throttling.c ACPI processor: remove deprecated ACPI procfs I/F 2010-08-15 00:31:45 -04:00
reboot.c ACPI: reboot.c: use new acpi_reset interface 2008-12-31 01:15:00 -05:00
sbs.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sbshc.c sbshc: acpi_device_class "smbus_host_controller" too long 2010-05-06 02:38:25 -04:00
sbshc.h ACPI: SBS: Ignore alarms coming from unknown devices 2007-12-14 15:14:06 -05:00
scan.c ACPI / ACPICA: Do not execute _PRW methods during initialization 2010-07-12 14:17:39 -04:00
sleep.c PM / ACPI: Blacklist systems known to require acpi_sleep=nonvs 2010-09-24 16:52:02 -04:00
sleep.h ACPI / Wakeup: Simplify enabling of wakeup devices 2010-07-06 22:09:38 -04:00
sysfs.c ACPI: fix build warnings resulting from merge window conflict 2010-09-28 21:38:01 -04:00
tables.c ACPI: delete the "acpi=ht" boot option 2010-03-14 20:58:38 -04:00
thermal.c ACPI thermal: make procfs I/F depend on CONFIG_ACPI_PROCFS 2010-08-15 00:37:33 -04:00
utils.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
video_detect.c ACPI video: fix a poor warning message 2010-09-28 21:38:01 -04:00
video.c gcc-4.6: ACPI: fix unused but set variables in ACPI 2010-08-15 00:53:08 -04:00
wakeup.c Merge branch 'acpica-gpe' into release 2010-08-15 00:25:40 -04:00