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| author | viresh kumar <viresh.kumar@linaro.org> | 2013-03-22 14:13:52 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-03-25 18:13:16 +0400 |
| commit | 187da1d97f3a949b967274d7ee2f95d3a4f39251 (patch) | |
| tree | 996416fe804a88984be9ed337a151127a472eb7e /drivers | |
| parent | 05e99c8cf9d4e53ef6e016815db40a89a6156529 (diff) | |
| download | linux-187da1d97f3a949b967274d7ee2f95d3a4f39251.tar.xz | |
cpufreq: stats: do cpufreq_cpu_put() corresponding to cpufreq_cpu_get()
In cpufreq_stats_free_sysfs() we aren't balancing calls to
cpufreq_cpu_get() with cpufreq_cpu_put(). This will never let us have
ref count to policy->kobj as zero.
We will get a hang if somehow cpufreq_driver_unregister() is called.
And that can happen when we compile our driver as module and
insmod/rmmod it.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index 2fd779eb1ed1..bfd6273fd873 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -180,15 +180,19 @@ static void cpufreq_stats_free_sysfs(unsigned int cpu) { struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); - if (!cpufreq_frequency_get_table(cpu)) + if (!policy) return; - if (policy && !policy_is_shared(policy)) { + if (!cpufreq_frequency_get_table(cpu)) + goto put_ref; + + if (!policy_is_shared(policy)) { pr_debug("%s: Free sysfs stat\n", __func__); sysfs_remove_group(&policy->kobj, &stats_attr_group); } - if (policy) - cpufreq_cpu_put(policy); + +put_ref: + cpufreq_cpu_put(policy); } static int cpufreq_stats_create_table(struct cpufreq_policy *policy, |