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cpufreq: Avoid false-positive WARN_ON()s in cpufreq_update_policy()

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CPU notifications from the firmware coming in when cpufreq is
suspended cause cpufreq_update_current_freq() to return 0 which
triggers the WARN_ON() in cpufreq_update_policy() for no reason.

Avoid that by checking cpufreq_suspended before calling
cpufreq_update_current_freq().

Fixes: c9d9c929e6 (cpufreq: Abort cpufreq_update_current_freq() for cpufreq_suspended set)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 4.6+ <stable@vger.kernel.org> # 4.6+
This commit is contained in:
Rafael J. Wysocki 2016-06-28 03:29:29 +02:00
parent ca5eda5d3d
commit 742c87bf27
1 changed files with 4 additions and 0 deletions
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4
drivers/cpufreq/cpufreq.c
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@ -2261,6 +2261,10 @@ int cpufreq_update_policy(unsigned int cpu)
* -> ask driver for current freq and notify governors about a change
*/
if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
if (cpufreq_suspended) {
ret = -EAGAIN;
goto unlock;
}
new_policy.cur = cpufreq_update_current_freq(policy);
if (WARN_ON(!new_policy.cur)) {
ret = -EIO;