linux-kernel - Re: [PATCH 3.19.y-ckt 084/164] thermal: exynos: Fix unbalanced regulator disable on probe failure

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Date:	Thu, 10 Dec 2015 09:49:37 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Kamal Mostafa <kamal@...onical.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, kernel-team@...ts.ubuntu.com
Cc:	k.kozlowski.k@...il.com, Eduardo Valentin <edubezval@...il.com>
Subject: Re: [PATCH 3.19.y-ckt 084/164] thermal: exynos: Fix unbalanced
 regulator disable on probe failure

On 09.12.2015 22:24, Krzysztof Kozlowski wrote:
> W dniu 03.12.2015 o 01:58, Kamal Mostafa pisze:
>> 3.19.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.
>>
>> ------------------
>>
>> From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>>
>> commit 824ead03b78403a21449cb7eb153a4344cd3b4c8 upstream.
>>
>> 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.
>>
>> 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.
>>
>> Acked-by: Lukasz Majewski <l.majewski@...sung.com>
>> Tested-by: Lukasz Majewski <l.majewski@...sung.com>
>> Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>> Fixes: 5f09a5cbd14a ("thermal: exynos: Disable the regulator on probe failure")
>> Signed-off-by: Eduardo Valentin <edubezval@...il.com>
>> Signed-off-by: Kamal Mostafa <kamal@...onical.com>
>> ---
>>  drivers/thermal/samsung/exynos_tmu.c | 33 ++++++++++++++++-----------------
>>  1 file changed, 16 insertions(+), 17 deletions(-)
> 
> This patch shouldn't be backported before 4.2. It fixes a bug introduced
> in 4.2: 5f09a5cbd14a.
> 
> For kernels <4.2 this bug does not exist but fortunately the patch looks
> harmless. Anyway I think that still it shouldn't be ported for <4.2.
> 
> Best regards,
> Krzysztof
> 

Sorry for the noise, I was wrong. Luis pointed out that the 5f09a5cbd14a
was itself backported to 3.19 so this applies to backporting as well.

No objections from my side.

Best regards,
Krzysztof

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