cpufreq: exynos: 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 sequence of
calling notifiers is complete.

This patch fixes it.

Cc: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index 475b4f607f0d..0d32f02ef4d6 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -113,7 +113,8 @@ static int exynos_cpufreq_scale(unsigned int target_freq)
                 if (ret) {
                         pr_err("%s: failed to set cpu voltage to %d\n",
                                 __func__, arm_volt);
-                        goto out;
+                        freqs.new = freqs.old;
+                        goto post_notify;
                 }
         }
 
@@ -123,14 +124,19 @@ static int exynos_cpufreq_scale(unsigned int target_freq)
                 if (ret) {
                         pr_err("%s: failed to set cpu voltage to %d\n",
                                 __func__, safe_arm_volt);
-                        goto out;
+                        freqs.new = freqs.old;
+                        goto post_notify;
                 }
         }
 
         exynos_info->set_freq(old_index, index);
 
+post_notify:
         cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
 
+        if (ret)
+                goto out;
+
         /* When the new frequency is lower than current frequency */
         if ((freqs.new < freqs.old) ||
            ((freqs.new > freqs.old) && safe_arm_volt)) {