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

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Message-ID: <Yn5Ts1+56rBip8Mc@sirena.org.uk>
Date:   Fri, 13 May 2022 13:48:51 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     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>,
        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
Subject: Re: [PATCH v1] driver core: Extend deferred probe timeout on driver
 registration

On Fri, Apr 29, 2022 at 03:09:32PM -0700, Saravana Kannan wrote:
> The deferred probe timer that's used for this currently starts at
> late_initcall and runs for driver_deferred_probe_timeout seconds. The
> assumption being that all available drivers would be loaded and
> registered before the timer expires. This means, the
> driver_deferred_probe_timeout has to be pretty large for it to cover the
> worst case. But if we set the default value for it to cover the worst
> case, it would significantly slow down the average case. For this
> reason, the default value is set to 0.

This makes sense to me.

Reviewed-by: Mark Brown <broonie@...nel.org>

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