linux/Documentation/power
Kevin Hilman 02b26774af PM / Runtime: Allow _put_sync() from interrupts-disabled context
Currently the use of pm_runtime_put_sync() is not safe from
interrupts-disabled context because rpm_idle() will release the
spinlock and enable interrupts for the idle callbacks.  This enables
interrupts during a time where interrupts were expected to be
disabled, and can have strange side effects on drivers that expected
interrupts to be disabled.

This is not a bug since the documentation clearly states that only
_put_sync_suspend() is safe in IRQ-safe mode.

However, pm_runtime_put_sync() could be made safe when in IRQ-safe
mode by releasing the spinlock but not re-enabling interrupts, which
is what this patch aims to do.

Problem was found when using some buggy drivers that set
pm_runtime_irq_safe() and used _put_sync() in interrupts-disabled
context.

Reported-by: Colin Cross <ccross@google.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-08-05 21:45:20 +02:00
..
regulator regulator: Remove supply_regulator_dev from machine configuration 2011-05-27 10:34:37 +01:00
00-INDEX PM: Introduce library for device-specific OPPs (v7) 2010-10-17 01:57:50 +02:00
apm-acpi.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
basic-pm-debugging.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
devices.txt PM / Runtime: Update documentation of interactions with system sleep 2011-07-02 14:30:09 +02:00
drivers-testing.txt PM: Fix references to basic-pm-debugging.txt in drivers-testing.txt 2010-12-24 15:02:41 +01:00
freezing-of-tasks.txt
interface.txt PM / Hibernate: Make default image size depend on total RAM size 2010-10-17 01:57:43 +02:00
notifiers.txt PM: Allow drivers to allocate memory from .prepare() callbacks safely 2011-05-17 23:26:00 +02:00
opp.txt PM / OPP: Introduce function to free cpufreq table 2011-07-15 23:58:18 +02:00
pci.txt PM/PCI: Update PCI power management documentation 2010-05-18 15:01:58 -07:00
pm_qos_interface.txt PM QOS update 2010-05-10 23:08:19 +02:00
power_supply_class.txt
runtime_pm.txt PM / Runtime: Allow _put_sync() from interrupts-disabled context 2011-08-05 21:45:20 +02:00
s2ram.txt PM: Add sysfs attr for rechecking dev hash from PM trace 2010-10-17 01:57:50 +02:00
states.txt PM: Documentation/power/states.txt: fix repetition 2011-03-15 00:43:17 +01:00
swsusp-and-swap-files.txt
swsusp-dmcrypt.txt
swsusp.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
tricks.txt update email address 2010-07-19 10:56:54 +02:00
userland-swsusp.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
video.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
video_extension.txt