linux-kernel - Re: [tip: timers/core] clocksource/drivers/timer-probe: Avoid creating dead devices

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Message-ID: <87lfnoxg2a.fsf@nanos.tec.linutronix.de>
Date:   Wed, 25 Mar 2020 22:47:25 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Saravana Kannan <saravanak@...gle.com>,
        Ionela Voinescu <ionela.voinescu@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-tip-commits@...r.kernel.org, x86 <x86@...nel.org>,
        liviu.dudau@....com, sudeep.holla@....com,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jon Hunter <jonathanh@...dia.com>
Subject: Re: [tip: timers/core] clocksource/drivers/timer-probe: Avoid creating dead devices

Saravana Kannan <saravanak@...gle.com> writes:
> On Tue, Mar 24, 2020 at 11:34 AM Saravana Kannan <saravanak@...gle.com> wrote:
> I took a closer look. So two different drivers [1] [2] are saying they
> know how to handle "arm,vexpress-sysreg" and are expecting to run at
> the same time. That seems a bit unusual to me. I wonder if this is a
> violation of the device-driver model because this expectation would
> never be allowed if these device drivers were actual drivers
> registered with driver-core. But that's a discussion for another time.
>
> To fix this issue you are facing, this patch should work:
> https://lore.kernel.org/lkml/20200324195302.203115-1-saravanak@google.com/T/#u

Sorry, that's not a fix. That's a crude hack.

As this is also causing trouble on tegra30-cardhu-a04 the only sane
solution is to revert it and start over with a proper solution for the
vexpress problem and a root cause analysis for the tegra.

Thanks,

        tglx