linux-kernel - Re: [PATCH 1/2 v3] mmc: dw_mmc: Fix the DTO timeout overflow calculation for 32-bit systems

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Message-ID: <CAHp75Vepn=nS9=WRpKhPLQ04EJEpL0tcne-DfV6ip-ELH9ggRA@mail.gmail.com>
Date:   Mon, 26 Feb 2018 16:40:34 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Evgeniy Didin <Evgeniy.Didin@...opsys.com>
Cc:     linux-mmc@...r.kernel.org,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Douglas Anderson <dianders@...omium.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-snps-arc@...ts.infradead.org,
        Stable <stable@...r.kernel.org>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: Re: [PATCH 1/2 v3] mmc: dw_mmc: Fix the DTO timeout overflow
 calculation for 32-bit systems

On Mon, Feb 26, 2018 at 4:34 PM, Evgeniy Didin
<Evgeniy.Didin@...opsys.com> wrote:
> In commit 9d9491a7da2a ("mmc: dw_mmc: Fix the DTO timeout calculation") have been made
> changes which cause multiply overflow for 32-bit systems.
> The broken timeout calculations caused false interrupt latency warnings
> and stacktrace splat (such as below) when accessing the SD Card.

> +       drto_ms = DIV_ROUND_UP((u64)MSEC_PER_SEC * drto_clks * drto_div,
>                                host->bus_hz);

Same as per patch 2.

-- 
With Best Regards,
Andy Shevchenko