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Subject[PATCH 08/10] cpufreq: Fix broken usage of governor->owner's refcount
Date
Governor's owner refcount usage was broken. We should increment refcount only
when CPUFREQ_GOV_POLICY_INIT event has come and should decrement only if
CPUFREQ_GOV_POLICY_EXIT has come.

Lets fix it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/cpufreq/cpufreq.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index e9b969f..74d4969 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1707,8 +1707,9 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
}
}

- if (!try_module_get(policy->governor->owner))
- return -EINVAL;
+ if (event == CPUFREQ_GOV_POLICY_INIT)
+ if (!try_module_get(policy->governor->owner))
+ return -EINVAL;

pr_debug("__cpufreq_governor for CPU %u, event %u\n",
policy->cpu, event);
@@ -1717,6 +1718,8 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
if ((!policy->governor_enabled && (event == CPUFREQ_GOV_STOP)) ||
(policy->governor_enabled && (event == CPUFREQ_GOV_START))) {
mutex_unlock(&cpufreq_governor_lock);
+ if (event == CPUFREQ_GOV_POLICY_INIT)
+ module_put(policy->governor->owner);
return -EBUSY;
}

@@ -1744,11 +1747,8 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
mutex_unlock(&cpufreq_governor_lock);
}

- /* we keep one module reference alive for
- each CPU governed by this CPU */
- if ((event != CPUFREQ_GOV_START) || ret)
- module_put(policy->governor->owner);
- if ((event == CPUFREQ_GOV_STOP) && !ret)
+ if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) ||
+ ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret))
module_put(policy->governor->owner);

return ret;
--
1.7.12.rc2.18.g61b472e


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