linux-kernel - Re: [PATCH v2 3/9] clocksource/cadence_ttc: Store timer frequency in driver data

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Message-ID: <52B21A82.7050608@linaro.org>
Date:	Wed, 18 Dec 2013 22:58:26 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
CC:	Michal Simek <michal.simek@...inx.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2 3/9] clocksource/cadence_ttc: Store timer frequency
 in driver data

On 12/18/2013 05:47 PM, Sören Brinkmann wrote:
> Hi Daniel,
>
> On Wed, Dec 18, 2013 at 03:53:51PM +0100, Daniel Lezcano wrote:
>> On 12/17/2013 08:21 PM, Sören Brinkmann wrote:
>>> Hi Daniel,
>>>
>>> On Tue, Nov 26, 2013 at 05:04:50PM -0800, Soren Brinkmann wrote:
>>>> It is not allowed to call clk_get_rate() from interrupt context. To
>>>> avoid such calls the timer input frequency is stored in the driver's
>>>> data struct which makes it accessible to the driver in any context.
>>>>
>>>> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
>>>> Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>>>
>>> I doubt that we'll resolve all issues with this series before the
>>> holidays or even the next merge window. Could you take this patch into
>>> your tree for 3.14? It is not directly related to the cpufreq work and
>>> fixes an actual issue that triggers a kernel WARN under some condition
>>> (I missed preserving the details and the trace). That would take the
>>> easy stuff out of the way and we can focus on the more controversial
>>> changes.
>>
>> You are asking to take it for 3.14 but shouldn't it go as a 3.13 fix ?
>
> That's also an option. As I remember, the patch fixes a kernel WARN. The
> system still seemed operational though. Up to you whether this is
> considered severe enough for the 3.13 series. I'm happy either way.

I was not able to reproduce the WARN with my board.

Please, could you give the WARN or give the procedure to reproduce it ?

Thanks
   -- Daniel


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