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

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Date:   Tue, 13 Nov 2018 16:33:45 -0800
From:   Mark Brown <broonie@...nel.org>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-usb@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Roger Quadros <rogerq@...com>, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sebastian Reichel <sre@...nel.org>, linux-omap@...r.kernel.org,
        Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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 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?

> 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 :(

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