linux-kernel - Re: [PATCH v1 1/5] drivercore: Revert "deferral race condition fix"

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Message-ID: <CAHp75Vf7qozL8abZSh1gv_F3iSiZCprEK5_eGW=SRyUpjYrmtA@mail.gmail.com>
Date:   Wed, 14 Nov 2018 10:45:22 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        USB <linux-usb@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        rogerq@...com, Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        Darren Hart <dvhart@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Grant Likely <grant.likely@...aro.org>,
        Andrzej Hajda <a.hajda@...sung.com>
Subject: Re: [PATCH v1 1/5] drivercore: Revert "deferral race condition fix"

On Wed, Nov 14, 2018 at 2:34 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Mon, Nov 12, 2018 at 06:11:26PM +0200, Peter Ujfalusi wrote:
>
> > if we revert the commit then the original issue will re-surfaces. afaik
> > it was not only audio which hit the 'last driver to be probed from the
> > deferred list would never probe, unless we provoke the kernel to load
> > additional module, or remove/reload the module' issue.
>
> Right, aren't we just going to be swapping one bug for another?

Have anyone in possession of Davinchi tested most recent kernel with
this revert?

> > Do I understand correctly that in your case you have two modules
> > (dwc3-pci and extcon-intel-mrfld) in a deferred probe loop, iow both of
> > the drivers returns -EPROBE_DEFER and they just spin?
>
> > If both is deferring, how this supposed to work?
>
> I'm struggling to follow the original explanation too :(

Sorry, guys, I confused a nit myself. The bug is there, but
exxplanation is not fully corrent, indeed. I'll come back with more
details later.

-- 
With Best Regards,
Andy Shevchenko