From d0563a039c9d35305f4cb2405665130de596d86a Mon Sep 17 00:00:00 2001 From: Tobias Jakobi Date: Thu, 29 Sep 2016 14:36:36 +0200 Subject: [PATCH] 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 Acked-by: MyungJoo Ham Signed-off-by: Rafael J. Wysocki --- drivers/devfreq/devfreq.c | 4 ++++ 1 file changed, 4 insertions(+) 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; -- 2.20.1