linux-kernel - Re: [PATCH v2 2/2] rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc

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Date:	Tue, 19 Jul 2016 17:50:13 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Alim Akhtar <alim.akhtar@...sung.com>
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	k.kozlowski@...sung.com, javier@....samsung.com,
	pankaj.dubey@...sung.com, stable@...r.kernel.org
Subject: Re: [PATCH v2 2/2] rtc: s3c: Add s3c_rtc_{enable/disable}_clk in
 s3c_rtc_setfreq()

On 05/07/2016 at 15:28:53 +0530, Alim Akhtar wrote :
> As per code flow s3c_rtc_setfreq() will get called with rtc clock disabled
> and in set_freq we perform h/w registers read/write, which results in a
> kernel crash on exynos7 platform while probing rtc driver.
> Below is code flow:
> s3c_rtc_probe()
>     clk_prepare_enable(info->rtc_clk) // rtc clock enabled
>     s3c_rtc_gettime() // will enable clk if not done, and disable it upon exit
>     s3c_rtc_setfreq() //then this will be called with clk disabled
> 
> This patch take cares of such issue by adding s3c_rtc_{enable/disable}_clk in
> s3c_rtc_setfreq().
> 
> Fixes: 24e1455493da ("drivers/rtc/rtc-s3c.c: delete duplicate clock control")
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reviewed-by: Pankaj Dubey <pankaj.dubey@...sung.com>
> Tested-by: Pankaj Dubey <pankaj.dubey@...sung.com>
> ---
>  drivers/rtc/rtc-s3c.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
Applied, thanks.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com