From d0563a039c9d35305f4cb2405665130de596d86a Mon Sep 17 00:00:00 2001
From: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Date: Thu, 29 Sep 2016 14:36:36 +0200
Subject: PM / devfreq: Skip status update on uninitialized previous_freq
In case devfreq->previous_freq is still uninitialized in
devfreq_update_status(), i.e. it has value '0', the lookups in
that function fail, eventually leading to some error message:
[ 3.041292] devfreq bus_dmc: Couldn't update frequency transition information.
Just skip the statup update in this situation.
Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/devfreq/devfreq.c | 4 ++++
1 file changed, 4 insertions(+)
(limited to 'drivers')
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 66d3c7184a0f..bf3ea7603a58 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -137,6 +137,10 @@ static int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
cur_time = jiffies;
+ /* Immediately exit if previous_freq is not initialized yet. */
+ if (!devfreq->previous_freq)
+ goto out;
+
prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq);
if (prev_lev < 0) {
ret = prev_lev;
--
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