cpufreq: ACPI: 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, 4 insertions, 2 deletions

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 0d25677fb37d..1f9849da4278 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -494,12 +494,14 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy,
                         pr_debug("acpi_cpufreq_target failed (%d)\n",
                                 policy->cpu);
                         result = -EAGAIN;
-                        goto out;
+                        freqs.new = freqs.old;
                 }
         }
 
         cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-        perf->state = next_perf_state;
+
+        if (!result)
+                perf->state = next_perf_state;
 
 out:
         return result;