diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-01-24 10:19:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-01-24 10:19:13 -0800 |
| commit | ba2ab41f3d68f277860768b2c5b197768b196332 (patch) | |
| tree | 807605fea8dcd16b89a8c4c95838e57e200019b5 /drivers/devfreq/devfreq.c | |
| parent | bff92411eb93b2b2a06c4de76e6811486771a76f (diff) | |
| parent | efa17194581bdfca0986dabc178908bd7c21ba00 (diff) | |
Merge tag 'pm+acpi-for-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management fixes from Rafael Wysocki:
- Two cpuidle initialization fixes from Konrad Rzeszutek Wilk.
- cpufreq regression fixes for AMD processors from Borislav Petkov,
Stefan Bader, and Matthew Garrett.
- ACPI cpufreq fix from Thomas Schlichter.
- cpufreq and devfreq fixes related to incorrect usage of operating
performance points (OPP) framework and RCU from Nishanth Menon.
- APEI workaround for incorrect BIOS information from Lans Zhang.
* tag 'pm+acpi-for-3.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
cpufreq: Add module aliases for acpi-cpufreq
ACPI: Check MSR valid bit before using P-state frequencies
PM / devfreq: exynos4_bus: honor RCU lock usage
PM / devfreq: add locking documentation for recommended_opp
cpufreq: cpufreq-cpu0: use RCU locks around usage of OPP
cpufreq: OMAP: use RCU locks around usage of OPP
ACPI, APEI: Fixup incorrect 64-bit access width firmware bug
ACPI / processor: Get power info before updating the C-states
powernow-k8: Add a kconfig dependency on acpi-cpufreq
ACPI / cpuidle: Fix NULL pointer issues when cpuidle is disabled
intel_idle: Don't register CPU notifier if we are not running.
Diffstat (limited to 'drivers/devfreq/devfreq.c')
| -rw-r--r-- | drivers/devfreq/devfreq.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 53766f39aad..3b367973a80 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -994,6 +994,11 @@ module_exit(devfreq_exit); * @freq: The frequency given to target function * @flags: Flags handed from devfreq framework. * + * Locking: This function must be called under rcu_read_lock(). opp is a rcu + * protected pointer. The reason for the same is that the opp pointer which is + * returned will remain valid for use with opp_get_{voltage, freq} only while + * under the locked area. The pointer returned must be used prior to unlocking + * with rcu_read_unlock() to maintain the integrity of the pointer. */ struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq, u32 flags) |