linux-kernel - Re: [PATCH 1/5] thermal: exynos: Fix unbalanced regulator disable on probe failure

Open Source and information security mailing list archives

Date:	Thu, 8 Oct 2015 22:15:22 +0530
From:	Alim Akhtar <alim.akhtar@...il.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Lukasz Majewski <l.majewski@...sung.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Kukjin Kim <kgene@...nel.org>, linux-pm@...r.kernel.org,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/5] thermal: exynos: Fix unbalanced regulator disable on
 probe failure

Hello,

On Thu, Oct 8, 2015 at 11:04 AM, Krzysztof Kozlowski
<k.kozlowski@...sung.com> wrote:
> During probe if the regulator could not be enabled, the error exit path
> would still disable it. This could lead to unbalanced counter of
> regulator enable/disable.
>
Do you see a regulator unbalanced reported here during boot? You may
want to add that to commit message.

> The patch moves code for getting and enabling the regulator from
> exynos_map_dt_data() to probe function because it is really not a part
> of getting Device Tree properties.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Fixes: 5f09a5cbd14a ("thermal: exynos: Disable the regulator on probe failure")
> Cc: <stable@...r.kernel.org>
> ---
>  drivers/thermal/samsung/exynos_tmu.c | 34 +++++++++++++++++-----------------
>  1 file changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 0bae8cc6c23a..23f4320f8ef7 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -1168,27 +1168,10 @@ static int exynos_map_dt_data(struct platform_device *pdev)
>         struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>         struct exynos_tmu_platform_data *pdata;
>         struct resource res;
> -       int ret;
>
>         if (!data || !pdev->dev.of_node)
>                 return -ENODEV;
>
> -       /*
> -        * Try enabling the regulator if found
> -        * TODO: Add regulator as an SOC feature, so that regulator enable
> -        * is a compulsory call.
> -        */
> -       data->regulator = devm_regulator_get(&pdev->dev, "vtmu");
> -       if (!IS_ERR(data->regulator)) {
> -               ret = regulator_enable(data->regulator);
> -               if (ret) {
> -                       dev_err(&pdev->dev, "failed to enable vtmu\n");
> -                       return ret;
> -               }
> -       } else {
> -               dev_info(&pdev->dev, "Regulator node (vtmu) not found\n");
> -       }
> -
>         data->id = of_alias_get_id(pdev->dev.of_node, "tmuctrl");
>         if (data->id < 0)
>                 data->id = 0;
> @@ -1312,6 +1295,23 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>                 pr_err("thermal: tz: %p ERROR\n", data->tzd);
>                 return PTR_ERR(data->tzd);
>         }
> +
> +       /*
> +        * Try enabling the regulator if found
> +        * TODO: Add regulator as an SOC feature, so that regulator enable
> +        * is a compulsory call.
> +        */
> +       data->regulator = devm_regulator_get(&pdev->dev, "vtmu");
> +       if (!IS_ERR(data->regulator)) {
> +               ret = regulator_enable(data->regulator);
> +               if (ret) {
> +                       dev_err(&pdev->dev, "failed to enable vtmu\n");
> +                       return ret;
> +               }
> +       } else {
> +               dev_info(&pdev->dev, "Regulator node (vtmu) not found\n");
> +       }
> +
>         ret = exynos_map_dt_data(pdev);
>         if (ret)
>                 goto err_sensor;
> --
> 1.9.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


-- 
Regards,
Alim
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

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