This introduces another routine cpufreq_notify_post_transition() which can be
used to send POSTCHANGE notification for new freq with or without both
{PRE|POST}CHANGE notifications for last freq in case of failures. This is useful
at multiple places, specially for sending transition failure notifications.
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
Hi Rafael,
Please see if you want to take it for 3.13 or 14, as this fixes bugs which are
partly introduced in 3.13..
drivers/cpufreq/cpufreq.c | 14 ++++++++++++++
include/linux/cpufreq.h | 2 ++
2 files changed, 16 insertions(+)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 606224a..a862aa9 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -324,6 +324,20 @@ void cpufreq_notify_transition(struct cpufreq_policy *policy,
}
EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
+/* Do post notifications when there are chances that transition has failed */
+void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
+ struct cpufreq_freqs *freqs, int transition_failed)
+{
+ cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
+ if (!transition_failed)
+ return;
+
+ swap(freqs->old, freqs->new);
+ cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
+ cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
+}
+EXPORT_SYMBOL_GPL(cpufreq_notify_post_transition);
+
/*********************************************************************
* SYSFS INTERFACE *
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index ee5fe9d..57e48db 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -314,6 +314,8 @@ int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list);
void cpufreq_notify_transition(struct cpufreq_policy *policy,
struct cpufreq_freqs *freqs, unsigned int state);
+void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
+ struct cpufreq_freqs *freqs, int transition_failed);
#else /* CONFIG_CPU_FREQ */
static inline int cpufreq_register_notifier(struct notifier_block *nb,
--
1.7.12.rc2.18.g61b472e
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