linux-kernel - Re: [PATCH 1/2] cpufreq: dt: Don't (ab)use dev_pm_opp_get_opp

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Message-ID: <20201110065923.lb53to2tjpubltkb@vireshk-i7>
Date:   Tue, 10 Nov 2020 12:29:23 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        digetx@...il.com, Stephan Gerhold <stephan@...hold.net>,
        linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH 1/2] cpufreq: dt: Don't (ab)use
 dev_pm_opp_get_opp_table() to create OPP table

On 10-11-20, 07:57, Marek Szyprowski wrote:
> Hi Viresh,
> 
> On 10.11.2020 07:00, Viresh Kumar wrote:
> > On 09-11-20, 13:42, Marek Szyprowski wrote:
> >> This patch landed in linux next-20201109 as commit e8f7703f8fe5
> >> ("cpufreq: dt: Don't (ab)use dev_pm_opp_get_opp_table() to create OPP
> >> table"). Sadly it causes regression on some Samsung Exynos based boards:
> >>
> >> 8<--- cut here ---
> >> Unable to handle kernel paging request at virtual address ffffff37
> >> pgd = (ptrval)
> >> [ffffff37] *pgd=4ffff841, *pte=00000000, *ppte=00000000
> >> Internal error: Oops: 27 [#1] PREEMPT SMP ARM
> >> Modules linked in:
> >> usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> >> CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.10.0-rc1-00007-ge8f7703f8fe5
> >> #1908
> >> Hardware name: Samsung Exynos (Flattened Device Tree)
> >> PC is at dev_pm_opp_put_regulators+0x8/0xf0
> >> LR is at dt_cpufreq_probe+0x19c/0x3fc
> > Does this fix it for you ?
> 
> Yes, thanks!
> 
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> 
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

Thanks. I have fixed the original patch itself and pushed for linux-next.

-- 
viresh