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Date: Mon, 7 Nov 2016 22:22:50 +0100
From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Lukas Wunner <lukas@wunner.de>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Linux PM list <linux-pm@vger.kernel.org>,
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        Tomeu Vizoso <tomeu.vizoso@collabora.com>,
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        Marek Szyprowski <m.szyprowski@samsung.com>,
        Kevin Hilman <khilman@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>
Subject: Re: [PATCH v5 2/5] driver core: Functional dependencies tracking
 support
Message-ID: <20161107212250.GH1764@wotan.suse.de>
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On Thu, Oct 27, 2016 at 05:25:51PM +0200, Greg Kroah-Hartman wrote:
> On Wed, Oct 26, 2016 at 01:19:02PM +0200, Lukas Wunner wrote:
> > Hi Rafael,
> > 
> > sorry for not responding to v5 of your series earlier, just sending
> > this out now in the hope that it reaches you before your travels.
> > 
> > On Mon, Oct 10, 2016 at 02:51:04PM +0200, Rafael J. Wysocki wrote:
> > > - Modify device_links_check_suppliers(), device_links_driver_bound(),
> > >   device_links_no_driver(), device_links_driver_cleanup(), device_links_busy(),
> > >   and device_links_unbind_consumers() to walk link lists under device_links_lock
> > >   (to make the new "driver presence tracking" mechanism work reliably).
> > 
> > This change might increase boot time if drivers return -EPROBE_DEFER.
> 
> "might"?  Please verify this before guessing....
> 
> And don't make this more complex than needed before actually determining
> a real issue.

As clarified by Rafael at Plumbers, this functional dependencies
framework assumes your driver / subsystem supports deferred probe,
if it does not support its not clear what will happen....

We have no explicit semantics to check if a driver / subsystem
supports deferred probe.

  Luis