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cpufreq: Fix serialization of frequency transitions

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Commit 7c30ed ("cpufreq: make sure frequency transitions are serialized")
interacts poorly with systems that have a single core freqency for all
cores.  On such systems we have a single policy for all cores with
several CPUs.  When we do a frequency transition the governor calls the
pre and post change notifiers which causes cpufreq_notify_transition()
per CPU.  Since the policy is the same for all of them all CPUs after
the first and the warnings added are generated by checking a per-policy
flag the warnings will be triggered for all cores after the first.

Fix this by allowing notifier to be called for n times. Where n is the number of
cpus in policy->cpus.

Reported-and-tested-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2013-07-02 16:36:28 +05:30 • committed by Rafael J. Wysocki
parent f991fae5c6
commit 266c13d767
2 changed files with 5 additions and 4 deletions
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include/linux/cpufreq.h
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@ -119,7 +119,7 @@ struct cpufreq_policy {
struct kobject kobj;
struct completion kobj_unregister;
bool transition_ongoing; /* Tracks transition status */
int transition_ongoing; /* Tracks transition status */
};
#define CPUFREQ_ADJUST (0)