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

[Alim Akhtar]

Hello,

On Thu, Oct 8, 2015 at 11:04 AM, Krzysztof Kozlowski
<k.kozlowski@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> Fixes: 5f09a5cbd14a ("thermal: exynos: Disable the regulator on probe failure")
> Cc: <stable@xxxxxxxxxxxxxxx>
> ---
>  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
>
>
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-- 
Regards,
Alim
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