linux-kernel - Re: [PATCH] hwrng: exynos - Fix unbalanced PM runtime get/puts

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Date:	Mon, 19 Oct 2015 10:41:12 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Daniel Thompson <daniel.thompson@...aro.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Matt Mackall <mpm@...enic.com>
Cc:	linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	patches@...aro.org, linaro-kernel@...ts.linaro.org,
	Kukjin Kim <kgene@...nel.org>
Subject: Re: [PATCH] hwrng: exynos - Fix unbalanced PM runtime get/puts

On 17.10.2015 01:01, Daniel Thompson wrote:
> Currently this driver calls pm_runtime_get_sync() rampantly
> but never puts anything back. This makes it impossible for the
> device to autosuspend properly; it will remain fully active
> after the first use.
> 
> Fix in the obvious way.
> 
> Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
> Cc: Kukjin Kim <kgene@...nel.org>
> Cc: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
> 
> Notes:
>     Compile tested only (CONFIG_PM=y, CONFIG_HW_RANDOM_EXYNOS=m); I spotted
>     this whilst reviewing the code and don't have an exynos platform to
>     test on.
> 
>  drivers/char/hw_random/exynos-rng.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

To test the patch I had to add OF support to the driver. I have these
patches almost ready and I will send them soon. Anyway:

Tested on Trats2 board (Exynos4412):
Tested-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof


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