diff options
| author | Lan Tianyu <tianyu.lan@intel.com> | 2013-09-11 09:05:05 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-09-11 23:30:03 +0200 |
| commit | 44871c9c7f7963f8869dd8bc9620221c9e9db153 (patch) | |
| tree | 06492eef7e60052d1a55f124b69f88727dbdbda1 | |
| parent | cpufreq: Prevent problems in update_policy_cpu() if last_cpu == new_cpu (diff) | |
| download | linux-44871c9c7f7963f8869dd8bc9620221c9e9db153.tar.xz linux-44871c9c7f7963f8869dd8bc9620221c9e9db153.zip | |
cpufreq: Acquire the lock in cpufreq_policy_restore() for reading
In cpufreq_policy_restore() before system suspend policy is read from
percpu's cpufreq_cpu_data_fallback. It's a read operation rather
than a write one, so take the lock for reading in there.
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index d32040cc1c46..43c24aa756f6 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -906,11 +906,11 @@ static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) struct cpufreq_policy *policy; unsigned long flags; - write_lock_irqsave(&cpufreq_driver_lock, flags); + read_lock_irqsave(&cpufreq_driver_lock, flags); policy = per_cpu(cpufreq_cpu_data_fallback, cpu); - write_unlock_irqrestore(&cpufreq_driver_lock, flags); + read_unlock_irqrestore(&cpufreq_driver_lock, flags); return policy; } |