From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: [PATCH v8 05/18] PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out Date: Sun, 3 Nov 2019 23:41:17 +0300 Message-ID: <20191103204130.2172-6-digetx@gmail.com> References: <20191103204130.2172-1-digetx@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20191103204130.2172-1-digetx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Thierry Reding , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Jonathan Hunter , Tomeu Vizoso , Peter Geis , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org 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 Tested-by: Peter Geis Signed-off-by: Dmitry Osipenko --- drivers/devfreq/tegra30-devfreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c index b50bd1615010..7d7b7eecc19c 100644 --- a/drivers/devfreq/tegra30-devfreq.c +++ b/drivers/devfreq/tegra30-devfreq.c @@ -69,6 +69,8 @@ #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 @@ -170,7 +172,7 @@ 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 }, -- 2.23.0