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: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index a6ba75f4106d80456e79b7d226875af24dff2254..e273011c83fbd986c885eba9e591ea03f99fddce 100644 (file)
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -68,6 +68,8 @@
 
 #define KHZ                                                    1000
 
+#define KHZ_MAX                                                (ULONG_MAX / KHZ)
+
 /* Assume that the bus is saturated if the utilization is 25% */
 #define BUS_SATURATION_RATIO                                   25
 
@@ -169,7 +171,7 @@ struct tegra_actmon_emc_ratio {
 };
 
 static struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {
-       { 1400000, ULONG_MAX },
+       { 1400000,    KHZ_MAX },
        { 1200000,    750000 },
        { 1100000,    600000 },
        { 1000000,    500000 },