Hi Krzysztof,
> During probe the regulator (if present) was enabled but not disabled
> in case of failure. So an unsuccessful probe lead to enabling the
> regulator which was actually not needed because the device was not
> enabled.
>
> Additionally each deferred probe lead to increase of regulator enable
> count so it would not be effectively disabled during removal of the
> device.
Thanks for catching this.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
> Fixes: 498d22f616f6 ("thermal: exynos: Support for TMU regulator
> defined at device tree") Cc: <stable@xxxxxxxxxxxxxxx>
>
> ---
>
> I am not entirely convinced that this should go to stable. Leaving a
> regulator enabled in case of probe failure (no exynos TMU device) or
> after deferred probe (regulator won't be disabled during device
> removal) is not a critical issue, just leaks power.
> ---
> drivers/thermal/samsung/exynos_tmu.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c
> b/drivers/thermal/samsung/exynos_tmu.c index
> 531f4b179871..13c3aceed19d 100644 ---
> a/drivers/thermal/samsung/exynos_tmu.c +++
> b/drivers/thermal/samsung/exynos_tmu.c @@ -1392,6 +1392,8 @@
> err_clk_sec: if (!IS_ERR(data->clk_sec))
> clk_unprepare(data->clk_sec);
> err_sensor:
> + if (!IS_ERR_OR_NULL(data->regulator))
> + regulator_disable(data->regulator);
> thermal_zone_of_sensor_unregister(&pdev->dev, data->tzd);
>
> return ret;
Acked-by: Lukasz Majewski <l.majewski@xxxxxxxxxxx>
I will test it and afterwards add to samsung-thermal tree.
--
Best regards,
Lukasz Majewski
Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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