On 2016년 03월 28일 11:54, MyungJoo Ham wrote:

quoted

  
 This patch adds the new DEVFREQ_TRANSITION_NOTIFIER notifier to send
the notification when the frequency of device is changed.
This notifier has two state as following:
- DEVFREQ_PRECHANGE  : Notify it before chaning the frequency of device
- DEVFREQ_POSTCHANGE : Notify it after changed the frequency of device

And this patch adds the resourced-managed function to release the resource
automatically when error happen.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board]
Tested-by: Markus Reichl <redacted>
Tested-by: Anand Moon <redacted>
---
 drivers/devfreq/devfreq.c | 163 +++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/devfreq.h   |  58 ++++++++++++++++-
 2 files changed, 219 insertions(+), 2 deletions(-)

[]

quoted

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index aa0b8424ebc3..152ea342529c 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h

@@ -19,6 +19,13 @@
 
 #define DEVFREQ_NAME_LEN 16
 
+/* DEVFREQ notifier interface */
+#define DEVFREQ_TRANSITION_NOTIFIER	(0)
+
+/* Transition notifiers of DEVFREQ_TRANSITION_NOTIFIER */
+#define	DEVFREQ_PRECHANGE		(0)
+#define DEVFREQ_POSTCHANGE		(1)
+
 struct devfreq;
 
 /**

@@ -177,6 +184,13 @@ struct devfreq {
 	unsigned int *trans_table;
 	unsigned long *time_in_state;
 	unsigned long last_stat_updated;
+
+	struct srcu_notifier_head transition_notifier_list;
+};

Like other properties of struct devfreq, please add
descriptions above. Other than that, it looks good.

OK. I was missing the description. I'll add it.

Best Regards,
Chanwoo Choi