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

commit 742c87bf27d3b715820da6f8a81d6357adbf18f8 upstream.

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: c9d9c929e674 (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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index c4acfc5273b3c1f8c5efc321f5ea8407a4b7f02b..e380457792ae3f233f95a4ee1ec8606183960afc 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2169,6 +2169,10 @@ 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;