From 151531f79a2daa30141c9fdb23e0cff00195b17a Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Thu, 2 May 2019 02:38:08 +0300 Subject: [PATCH] PM / devfreq: tegra: Avoid inconsistency of current frequency value The frequency value potentially could change in-between. It doesn't cause any real problem at all right now, but that could change in the future. Hence let's avoid the inconsistency. Reviewed-by: Chanwoo Choi Signed-off-by: Dmitry Osipenko Acked-by: Thierry Reding Signed-off-by: MyungJoo Ham --- drivers/devfreq/tegra-devfreq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c index 7e9145bd3686..f23f7b35863b 100644 --- a/drivers/devfreq/tegra-devfreq.c +++ b/drivers/devfreq/tegra-devfreq.c @@ -497,13 +497,15 @@ static int tegra_devfreq_get_dev_status(struct device *dev, { struct tegra_devfreq *tegra = dev_get_drvdata(dev); struct tegra_devfreq_device *actmon_dev; + unsigned long cur_freq; - stat->current_frequency = tegra->cur_freq * KHZ; + cur_freq = READ_ONCE(tegra->cur_freq); /* To be used by the tegra governor */ stat->private_data = tegra; /* The below are to be used by the other governors */ + stat->current_frequency = cur_freq * KHZ; actmon_dev = &tegra->devices[MCALL]; @@ -514,7 +516,7 @@ static int tegra_devfreq_get_dev_status(struct device *dev, stat->busy_time *= 100 / BUS_SATURATION_RATIO; /* Number of cycles in a sampling period */ - stat->total_time = ACTMON_SAMPLING_PERIOD * tegra->cur_freq; + stat->total_time = ACTMON_SAMPLING_PERIOD * cur_freq; stat->busy_time = min(stat->busy_time, stat->total_time);