PM / devfreq: Do not show statistics if it's not ready.
Before this patch for a device without statistics support,
$ cat trans_stat
From : To
: time(ms)
Total transitions : 0
$
After this patch applied for such a device,
$ cat trans_stat
Not Supported.
$
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index d36fa2d..984c5e9 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1049,6 +1049,8 @@
if (!devfreq->stop_polling &&
devfreq_update_status(devfreq, devfreq->previous_freq))
return 0;
+ if (max_state == 0)
+ return sprintf(buf, "Not Supported.\n");
len = sprintf(buf, " From : To\n");
len += sprintf(buf + len, " :");