linux-kernel - Re: [PATCH v5 0/6] driver core: Improve and cleanup driver_deferred_probe_check

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Date:   Thu, 23 Apr 2020 15:35:14 +0100
From:   Mark Brown <broonie@...nel.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Eugeniu Rosca <erosca@...adit-jv.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Todd Kjos <tkjos@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-renesas-soc@...r.kernel.org,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v5 0/6] driver core: Improve and cleanup
 driver_deferred_probe_check_state()

On Wed, Apr 22, 2020 at 01:45:49PM -0700, John Stultz wrote:
> On Wed, Apr 22, 2020 at 12:54 AM Mark Brown <broonie@...nel.org> wrote:

> > If you're reverting the timeout we should revert the regulator change
> > too I think.

> Maybe? The main issue for me was my change was clearly breaking users
> with dts with missing dependencies where their setup was working
> before. I sort of feel like having a dtb with missing dependencies is
> less valid than wanting to load module dependencies from userland, but
> they were working first, so we have to keep them happy :) And at least
> now the latter can add the timeout boot argument to make it work.

> For your case, I'm not sure if the timeout would run afoul on the nfs
> root mounting case this one tripped over.

Given that it's basically entirely about glitching displays rather than
an unrecoverable break I suspect that anyone using NFS root is some
combination of unaffected or doesn't care if they see the timeout kick
in.

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