linux-kernel - Re: [PATCH v4 15/24] PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out

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Message-ID: <bf0cf31f-4a03-f8f5-ac7b-280a384bb09d@samsung.com>
Date:   Tue, 16 Jul 2019 21:32:13 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 15/24] PM / devfreq: tegra30: Fix integer overflow on
 CPU's freq max out

On 19. 7. 8. 오전 7:32, Dmitry Osipenko wrote:
> 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.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/devfreq/tegra30-devfreq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index 0de1efdaabf4..60ebf9c9cd86 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -172,7 +172,7 @@ struct tegra_actmon_emc_ratio {
>  };
>  
>  static const struct tegra_actmon_emc_ratio actmon_emc_ratios[] = {
> -	{ 1400000, ULONG_MAX },
> +	{ 1400000, ULONG_MAX / KHZ },
>  	{ 1200000,    750000 },
>  	{ 1100000,    600000 },
>  	{ 1000000,    500000 },
> 

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics