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authorDmitry Osipenko <digetx@gmail.com>2019-05-02 02:38:08 +0300
committerMyungJoo Ham <myungjoo.ham@samsung.com>2019-08-24 14:11:12 +0300
commit151531f79a2daa30141c9fdb23e0cff00195b17a (patch)
tree02328144f0d0e452ab747527981e171eb031ee7d /drivers/devfreq
parent8fda5c1fab4f8df22bad43ba93a5ba83594ac256 (diff)
downloadlinux-151531f79a2daa30141c9fdb23e0cff00195b17a.tar.xz
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 <cw00.choi@samsung.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/tegra-devfreq.c6
1 files 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);