linux-kernel - Re: [PATCH v1] driver core: Extend deferred probe timeout on driver registration

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Date:   Tue, 24 May 2022 10:46:49 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Will Deacon <will@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        Thierry Reding <treding@...dia.com>,
        Mark Brown <broonie@...nel.org>, Pavel Machek <pavel@....cz>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        linux-gpio@...r.kernel.org, linux-pm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, kernel-team@...roid.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, John Stultz <jstultz@...gle.com>
Subject: Re: [PATCH v1] driver core: Extend deferred probe timeout on driver registration

On Tue, May 24, 2022 at 9:41 AM Sebastian Andrzej Siewior
<bigeasy@...utronix.de> wrote:
>
> On 2022-05-23 20:43:06 [-0700], Saravana Kannan wrote:
> …
> > Thanks for all the help. I think I know what's going on.
>
> I, too got here because my boot recently was extended by 10 seconds and
> bisected to that commit in question.
>
> > If you revert the following commit, then you'll see that your device
> > no longer hangs with my changes.
> > 35a672363ab3 driver core: Ensure wait_for_device_probe() waits until
> > the deferred_probe_timeout fires
>
> Removing probe_timeout_waitqueue (as suggested) or setting the timeout
> to 0 avoids the delay.

In your case, I think it might be working as intended? Curious, what
was the call stack in your case where it was blocked?

-Saravana