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authorViresh Kumar <viresh.kumar@linaro.org>2016-02-11 15:01:13 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-03-09 16:41:01 +0300
commit99522fe6788f5bf627dce7c20ed9484c933511a3 (patch)
tree55353e0c03780e911cf855135f32f02565fd9603 /drivers/cpufreq/cpufreq_governor.h
parent49f18560f8bac5315047edfb673dd13d56cbcbc9 (diff)
downloadlinux-99522fe6788f5bf627dce7c20ed9484c933511a3.tar.xz
cpufreq: Remove cpufreq_governor_lock
We used to drop policy->rwsem just before calling __cpufreq_governor() in some cases earlier and so it was possible that __cpufreq_governor() ran concurrently via separate threads for the same policy. In order to guarantee valid state transitions for governors, 'governor_enabled' was required to be protected using some locking and cpufreq_governor_lock was added for that. But now __cpufreq_governor() is always called under policy->rwsem, and 'governor_enabled' is protected against races even without cpufreq_governor_lock. Get rid of the extra lock now. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Juri Lelli <juri.lelli@arm.com> Tested-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> [ rjw : Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/cpufreq_governor.h')
-rw-r--r--drivers/cpufreq/cpufreq_governor.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index 8bf4775ce03c..e9ec411042c3 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -232,7 +232,6 @@ static inline int delay_for_sampling_rate(unsigned int sampling_rate)
}
extern struct mutex dbs_data_mutex;
-extern struct mutex cpufreq_governor_lock;
void dbs_check_cpu(struct cpufreq_policy *policy);
int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event);
void od_register_powersave_bias_handler(unsigned int (*f)