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[v3,14/22] PM / devfreq: tegra30: Ensure that target freq won't overflow

Message ID 20190627211115.21138-15-digetx@gmail.com (mailing list archive)
State Not Applicable, archived
Headers show
Series More improvements for Tegra30 devfreq driver | expand

Commit Message

Dmitry Osipenko June 27, 2019, 9:11 p.m. UTC 
Potentially very high boosting could cause an integer overflow for a
highly clocked memory after conversion to MHz.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/devfreq/tegra30-devfreq.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index d3e117d827d2..f86593ab3008 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -459,6 +459,7 @@  static unsigned long actmon_update_target(struct tegra_devfreq *tegra,
 {	unsigned long target_freq;
 
 	target_freq = dev->avg_count / ACTMON_SAMPLING_PERIOD + dev->boost_freq;
+	target_freq = min(target_freq, ULONG_MAX / KHZ);
 	target_freq = tegra_actmon_account_cpu_freq(tegra, dev, target_freq);
 
 	return target_freq;