linux-kernel - Re: [PATCH] thermal: exynos: Disable the regulator on probe failure

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Message-ID: <CABxcv=me__Nor+grdD+GaGJNZT5hRt6Tq7VBN1=yNzj+qw-zww@mail.gmail.com>
Date:	Mon, 8 Jun 2015 08:54:44 +0200
From:	Javier Martinez Canillas <javier@...hile0.org>
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-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 <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH] thermal: exynos: Disable the regulator on probe failure

Hello Krzysztof,

On Mon, Jun 8, 2015 at 3:35 AM, Krzysztof Kozlowski
<k.kozlowski@...sung.com> wrote:
> 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.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Fixes: 498d22f616f6 ("thermal: exynos: Support for TMU regulator defined at device tree")
> Cc: <stable@...r.kernel.org>
>

Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

> ---
>
> 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.


Yes, as you said leaving the regulator enabled is not critical but
OTOH is a very small patch and is fixing a very evident bug so I think
it's OK.

Best regards,
Javier
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