cpufreq: pcc: call CPUFREQ_POSTCHANGE notfier in error cases

PRECHANGE and POSTCHANGE notifiers must be called in groups, i.e
either both should be called or both shouldn't be.

In case we have started PRECHANGE notifier and found an error, we
must call POSTCHANGE notifier with freqs.new = freqs.old to guarantee
that the sequence of calling notifiers is complete.

This patch fixes it.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
index 0de00081a81e..1581fcc4cf4a 100644
--- a/drivers/cpufreq/pcc-cpufreq.c
+++ b/drivers/cpufreq/pcc-cpufreq.c
@@ -243,6 +243,8 @@ static int pcc_cpufreq_target(struct cpufreq_policy *policy,
         return 0;
 
 cmd_incomplete:
+        freqs.new = freqs.old;
+        cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
         iowrite16(0, &pcch_hdr->status);
         spin_unlock(&pcc_lock);
         return -EINVAL;