lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAGTfZH37=e4RgdR4xg-3s9-pRjqunHi2jfPQqQgVWkxW94GwOA@mail.gmail.com>
Date:   Tue, 5 Jan 2021 13:13:35 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com,
        dl-linux-imx <linux-imx@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>, yuq825@...il.com,
        David Airlie <airlied@...ux.ie>, daniel@...ll.ch,
        robdclark@...il.com, sean@...rly.run,
        Rob Herring <robh@...nel.org>, tomeu.vizoso@...labora.com,
        steven.price@....com, alyssa.rosenzweig@...labora.com,
        stanimir.varbanov@...aro.org, agross@...nel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        mchehab@...nel.org, Lukasz Luba <lukasz.luba@....com>,
        adrian.hunter@...el.com, Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>, jirislaby@...nel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, jcrouse@...eaurora.org,
        hoegsberg@...gle.com, eric@...olt.net, tzimmermann@...e.de,
        marijn.suijten@...ainline.org, gustavoars@...nel.org,
        emil.velikov@...labora.com, jonathan@...ek.ca,
        akhilpo@...eaurora.org, smasetty@...eaurora.org,
        airlied@...hat.com, masneyb@...tation.org, kalyan_t@...eaurora.org,
        tanmay@...eaurora.org, ddavenport@...omium.org,
        jsanka@...eaurora.org, rnayak@...eaurora.org,
        tongtiangen@...wei.com, miaoqinglang@...wei.com,
        khsieh@...eaurora.org, abhinavk@...eaurora.org,
        chandanu@...eaurora.org, Guenter Roeck <groeck@...omium.org>,
        varar@...eaurora.org, Matthias Kaehlcke <mka@...omium.org>,
        harigovi@...eaurora.org, rikard.falkeborn@...il.com,
        natechancellor@...il.com, Georgi Djakov <georgi.djakov@...aro.org>,
        akashast@...eaurora.org, parashar@...eaurora.org,
        Doug Anderson <dianders@...omium.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-tegra@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        lima@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, linux-media@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH 28/31] PM / devfreq: imx8m-ddrc: convert to use
 devm_pm_opp_* API

On Sun, Jan 3, 2021 at 12:58 PM Yangtao Li <tiny.windzz@...il.com> wrote:
>
> Use devm_pm_opp_* API to simplify code.
>
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/devfreq/imx8m-ddrc.c | 15 ++-------------
>  1 file changed, 2 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c
> index bc82d3653bff..9383d6e5538b 100644
> --- a/drivers/devfreq/imx8m-ddrc.c
> +++ b/drivers/devfreq/imx8m-ddrc.c
> @@ -370,11 +370,6 @@ static int imx8m_ddrc_check_opps(struct device *dev)
>         return 0;
>  }
>
> -static void imx8m_ddrc_exit(struct device *dev)
> -{
> -       dev_pm_opp_of_remove_table(dev);
> -}
> -
>  static int imx8m_ddrc_probe(struct platform_device *pdev)
>  {
>         struct device *dev = &pdev->dev;
> @@ -419,7 +414,7 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>                 return ret;
>         }
>
> -       ret = dev_pm_opp_of_add_table(dev);
> +       ret = devm_pm_opp_of_add_table(dev);
>         if (ret < 0) {
>                 dev_err(dev, "failed to get OPP table\n");
>                 return ret;
> @@ -427,12 +422,11 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>
>         ret = imx8m_ddrc_check_opps(dev);
>         if (ret < 0)
> -               goto err;
> +               return ret;
>
>         priv->profile.polling_ms = 1000;
>         priv->profile.target = imx8m_ddrc_target;
>         priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;
> -       priv->profile.exit = imx8m_ddrc_exit;
>         priv->profile.get_cur_freq = imx8m_ddrc_get_cur_freq;
>         priv->profile.initial_freq = clk_get_rate(priv->dram_core);
>
> @@ -441,13 +435,8 @@ static int imx8m_ddrc_probe(struct platform_device *pdev)
>         if (IS_ERR(priv->devfreq)) {
>                 ret = PTR_ERR(priv->devfreq);
>                 dev_err(dev, "failed to add devfreq device: %d\n", ret);
> -               goto err;
>         }
>
> -       return 0;
> -
> -err:
> -       dev_pm_opp_of_remove_table(dev);
>         return ret;

devm_devfreq_add_device() doesn't return any integer value.
Even if devm_devfreq_add_device() returns the right devfreq instance,
the 'ret' value  is not the return value of  devm_devfreq_add_device().

On this patch, 'ret' value of 'return ret' is from imx8m_ddrc_check_opps().
Surely, it is well working with this modification. But, it is not code
for exception handling.
So, we need to remain the following codes:

    return 0;
err:
    return ret;

>  }
>
> --
> 2.25.1
>


-- 
Best Regards,
Chanwoo Choi

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ