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UPSTREAM: PM / devfreq: Do not show statistics if it's not ready.

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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>
(cherry picked from commit 34bd322070)

Change-Id: Iae8a0e839cdd9b6d2e1c5c1332d85796b928f535
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
This commit is contained in:
MyungJoo Ham
2015-11-23 15:45:36 +09:00
committed by Tao Huang
parent 33233041f0
commit 5809cdffe4
1 changed files with 2 additions and 0 deletions
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2
drivers/devfreq/devfreq.c
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@@ -1138,6 +1138,8 @@ static ssize_t trans_stat_show(struct device *dev,
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, " :");