ACPI and power management fixes for 3.14-rc6
- ACPI tables in some BIOSes list device resources with size equal
to 0, which doesn't make sense, so we should ignore them, but
instead we try to use them and mangle things completely. Fix
from Zhang Rui.
- Several models of Samsung laptops accumulate EC events when they
are in sleep states which leads to EC buffer overflows that prevent
new events from being signaled after system resume or reboot. This
has been affecting many users for quite a while and may be addressed
by clearing the EC buffer during system resume and system startup on
those machines. From Kieran Clancy.
- If the ACPI sleep control and status registers are not present
(which happens if the Hardware Reduced ACPI mode bit is set in
the ACPI tables, but also may result from BIOS bugs), we should
not try to use ACPI to power off the system and ACPI S5 should
not be listed as supported. Fix from Aubrey Li.
- There's a race condition in cpufreq_get() that leads to a kernel
crash if that function is called at a wrong time. Fix from
Aaron Plattner.
- cpufreq policy objects have to be initialized entirely before
they are first accessed by their users which isn't the case
currently and that potentially leads to various kinds of
breakage that is difficult to debug. Fix from Viresh Kumar.
- Locking is missing in __cpufreq_add_dev() which leads to a race
condition that may trigger a kernel crash. Fix from Viresh Kumar.
/
Merge branch 'pm-cpufreq'
* pm-cpufreq:
cpufreq: Initialize governor for a new policy under policy->rwsem
cpufreq: Initialize policy before making it available for others to use
cpufreq: use cpufreq_cpu_get() to avoid cpufreq_get() race conditions
