Messages in this thread | | | Date | Wed, 5 Oct 2022 14:37:14 +0200 | Subject | Re: [PATCH v8 00/29] Rework the trip points creation | From | Daniel Lezcano <> |
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Hi Marek,
On 03/10/2022 23:18, Daniel Lezcano wrote:
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>> I've tested this v8 patchset after fixing the issue with Exynos TMU with >> https://lore.kernel.org/all/20221003132943.1383065-1-daniel.lezcano@linaro.org/ >> >> patch and I got the following lockdep warning on all Exynos-based boards: >> >> >> ====================================================== >> WARNING: possible circular locking dependency detected >> 6.0.0-rc1-00083-ge5c9d117223e #12945 Not tainted >> ------------------------------------------------------ >> swapper/0/1 is trying to acquire lock: >> c1ce66b0 (&data->lock#2){+.+.}-{3:3}, at: exynos_get_temp+0x3c/0xc8 >> >> but task is already holding lock: >> c2979b94 (&tz->lock){+.+.}-{3:3}, at: >> thermal_zone_device_update.part.0+0x3c/0x528 >> >> which lock already depends on the new lock. > > I'm wondering if the problem is not already there and related to > data->lock ... > > Doesn't the thermal zone lock already prevent racy access to the data > structure? > > Another question: if the sensor clock is disabled after reading it, how > does the hardware update the temperature and detect the programed > threshold is crossed?
just a gentle ping, as the fix will depend on your answer ;)
Thanks
-- D.
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