cpufreq: don't allow governor limits to be changed when it is disabled

__cpufreq_governor() returns with -EBUSY when governor is already
stopped and we try to stop it again, but when it is stopped we must
not allow calls to CPUFREQ_GOV_LIMITS event as well.

This patch adds this check in __cpufreq_governor().

Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 5c75e31..06a2496 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1692,8 +1692,9 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
                                                policy->cpu, event);
 
        mutex_lock(&cpufreq_governor_lock);
-       if ((!policy->governor_enabled && (event == CPUFREQ_GOV_STOP)) ||
-           (policy->governor_enabled && (event == CPUFREQ_GOV_START))) {
+       if ((policy->governor_enabled && event == CPUFREQ_GOV_START)
+           || (!policy->governor_enabled
+           && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) {
                mutex_unlock(&cpufreq_governor_lock);
                return -EBUSY;
        }