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From:   Viresh Kumar <viresh.kumar@linaro.org>
Date:   Thu, 13 Sep 2018 13:18:34 +0530
Message-ID: <CAKohpomVR_U9cA2yFLWjQ0pLdjp_d8=s2C7cvbauacha0Uv8xw@mail.gmail.com>
Subject: Re: [PATCH 00/11] OPP: Don't create multiple OPP tables for devices
 sharing OPP table
To:     Niklas Cassel <niklas.cassel@linaro.org>
Cc:     Andrew Lunn <andrew@lunn.ch>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Nishanth Menon <nm@ti.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Viresh Kumar <vireshk@kernel.org>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        "4.18" <stable@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On 12 September 2018 at 19:25, Niklas Cassel <niklas.cassel@linaro.org> wrote:
> On Wed, Sep 12, 2018 at 01:58:39PM +0530, Viresh Kumar wrote:
>> Hello,
>>
>> Niklas Cassle recently reported some regressions with his Qcom cpufreq
>> driver where he was getting some errors while creating the OPPs tables.
>>
>> After looking into it I realized that the OPP core incorrectly creates
>> multiple OPP tables for the devices even if they are sharing the OPP
>> table in DT. This happens when the request comes using different CPU
>> devices. For example, dev_pm_opp_set_supported_hw() getting called using
>> CPU0 and dev_pm_opp_of_add_table() getting called using CPU1.
>>
>> This series redesigns the internals of the OPP core to fix that. The
>> redesign has simplified the core itself though.
>>
>> @Niklas: Can you please confirm that this series fixes the issues you
>> have reported ? I have already tested it on Hikey960.
>
> Hello Viresh,
>
> This fixes the OPP error messages that I previously reported.
>
> However, I also tested to add a duplicate OPP to the opp-table.
>
> Before this series, I got the first two error prints.
> After this series, I get the first two error prints + the use after free splat.

This looks to be an old bug. Can you please try this branch:

git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git opp/qcom-fix

?