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cpufreq: governors: Fix WARN_ON() for multi-policy platforms

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On multi-policy systems there is a single instance of governor for both the
policies (if same governor is chosen for both policies). With the code update
from following patches:

8eeed09 cpufreq: governors: Get rid of dbs_data->enable field
b394058 cpufreq: governors: Reset tunables only for cpufreq_unregister_governor()

We are creating/removing sysfs directory of governor for for every call to
GOV_START and STOP. This would fail for multi-policy system as there is a
per-policy call to START/STOP.

This patch reuses the governor->initialized variable to detect total users of
governor.

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
2013-02-07 12:51:27 +05:30
committed by Rafael J. Wysocki
parent 4bd4e42819
commit 8e53695f7f
2 changed files with 23 additions and 15 deletions
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6
drivers/cpufreq/cpufreq.c
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@@ -1552,8 +1552,10 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
policy->cpu, event);
ret = policy->governor->governor(policy, event);
if (!policy->governor->initialized && (event == CPUFREQ_GOV_START))
policy->governor->initialized = 1;
if (event == CPUFREQ_GOV_START)
policy->governor->initialized++;
else if (event == CPUFREQ_GOV_STOP)
policy->governor->initialized--;
/* we keep one module reference alive for
each CPU governed by this CPU */