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Commit 0a06f599 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Greg Kroah-Hartman
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PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out 



[ Upstream commit 53b4b2aeee26f42cde5ff2a16dd0d8590c51a55a ]

There is another kHz-conversion bug in the code, resulting in integer
overflow. Although, this time the resulting value is 4294966296 and it's
close to ULONG_MAX, which is okay in this case.

Reviewed-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Tested-by: default avatarPeter Geis <pgwipeout@gmail.com>
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent b11dcb6c

drivers/devfreq/tegra-devfreq.c

+3 −1
Original line number Original line Diff line number Diff line
@@ -79,6 +79,8 @@ 




#define KHZ							1000

#define KHZ							1000





#define KHZ_MAX						(ULONG_MAX / KHZ)



/* Assume that the bus is saturated if the utilization is 25% */

/* Assume that the bus is saturated if the utilization is 25% */

#define BUS_SATURATION_RATIO					25

#define BUS_SATURATION_RATIO					25
@@ -179,7 +181,7 @@ struct tegra_actmon_emc_ratio { 
};

};





static struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {

static struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {

	{ 1400000, ULONG_MAX },

	{ 1400000,    KHZ_MAX },

	{ 1200000,    750000 },

	{ 1200000,    750000 },

	{ 1100000,    600000 },

	{ 1100000,    600000 },

	{ 1000000,    500000 },

	{ 1000000,    500000 },