Re: [GIT PULL] On-demand device probing

From	"Rafael J. Wysocki" <rafael@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [GIT PULL] On-demand device probing
Date	2015-10-25 15:00 +0100
Message-ID	<qnu01-3FT-9@gated-at.bofh.it> (permalink)
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On Sun, Oct 25, 2015 at 12:06 AM, Mark Brown <broonie@kernel.org> wrote:
> On Sat, Oct 24, 2015 at 04:17:12PM +0200, Rafael J. Wysocki wrote:
>
>> Well, I'm not quite sure why exactly everyone is so focused on probing here.
>
> Probe deferral is really noisy even if it's working fine on a given
> system so it's constantly being highlighted to people in a way that
> other issues aren't if you're not directly having problems.
>
> There's also the understanding people had that the order things get
> bound changes the ordering for some of the other cases (perhaps it's a
> good idea to do that, it seems likely to be sensible?).

But it really doesn't do that.  Also making it do so doesn't help much
in the cases where things can happen asynchronously (system
suspend/resume, runtime PM).

If, instead, there was a way to specify a functional dependency at the
device registration time, it might be used to change the order of
everything relevant, including probe.  That should help to reduce the
noise you're referring to.

If the dependency could only be discovered at the probe time, the
order of things might be changed in response to letting the driver
core know about it rather than "just in case", which should be more
efficient.

Thanks,
Rafael
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Thread

Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-18 21:40 +0200
  Re: [GIT PULL] On-demand device probing Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-18 21:40 +0200
    Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-18 22:00 +0200
      Re: [GIT PULL] On-demand device probing David Woodhouse <dwmw2@infradead.org> - 2015-10-19 11:50 +0200
        Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 12:00 +0200
        Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-19 13:10 +0200
        Re: [GIT PULL] On-demand device probing Rob Herring <robh+dt@kernel.org> - 2015-10-19 14:40 +0200
          Re: [GIT PULL] On-demand device probing David Woodhouse <dwmw2@infradead.org> - 2015-10-19 14:50 +0200
            Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-19 17:00 +0200
              Re: [GIT PULL] On-demand device probing David Woodhouse <dwmw2@infradead.org> - 2015-10-19 17:40 +0200
                Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 17:50 +0200
                Re: [GIT PULL] On-demand device probing Uwe Kleine-König   <u.kleine-koenig@pengutronix.de> - 2015-10-19 20:30 +0200
                Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 20:50 +0200
                Re: [GIT PULL] On-demand device probing Alexandre Courbot <gnurou@gmail.com> - 2015-10-20 01:50 +0200
                Re: gpiod API considerations [Was: [GIT PULL] On-demand device  probing] Uwe Kleine-König   <u.kleine-koenig@pengutronix.de> - 2015-10-20 09:20 +0200
                Re: [GIT PULL] On-demand device probing David Woodhouse <dwmw2@infradead.org> - 2015-10-20 13:20 +0200
                Re: [GIT PULL] On-demand device probing Rob Herring <robh+dt@kernel.org> - 2015-10-19 18:00 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-19 23:20 +0200
                Re: [GIT PULL] On-demand device probing Rob Herring <robh@kernel.org> - 2015-10-20 01:00 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-20 09:30 +0200
                Re: [GIT PULL] On-demand device probing Rob Herring <robh@kernel.org> - 2015-10-20 16:20 +0200
                Re: [GIT PULL] On-demand device probing Alan Stern <stern@rowland.harvard.edu> - 2015-10-20 16:50 +0200
                Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-20 17:40 +0200
                Re: [GIT PULL] On-demand device probing Alan Stern <stern@rowland.harvard.edu> - 2015-10-20 18:10 +0200
                Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-20 18:30 +0200
                Re: [GIT PULL] On-demand device probing Alan Stern <stern@rowland.harvard.edu> - 2015-10-20 19:20 +0200
                Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-20 21:40 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-21 01:10 +0200
                Re: [GIT PULL] On-demand device probing Jean-Francois Moine <moinejf@free.fr> - 2015-10-21 08:20 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-22 02:30 +0200
                Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-22 11:20 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-27 05:40 +0100
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-21 01:10 +0200
                Re: [GIT PULL] On-demand device probing Geert Uytterhoeven <geert@linux-m68k.org> - 2015-10-21 11:00 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-22 01:20 +0200
                Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-19 18:10 +0200
      Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-19 14:40 +0200
        Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 15:20 +0200
          Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-19 16:20 +0200
            Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 16:40 +0200
              Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-19 17:10 +0200
                Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 17:40 +0200
                Re: [GIT PULL] On-demand device probing Geert Uytterhoeven <geert@linux-m68k.org> - 2015-10-19 18:30 +0200
                Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-19 18:50 +0200
                Re: Alternative approach to solve the deferred probe (was: [GIT  PULL] On-demand device probing) Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-20 17:50 +0200
                Re: Alternative approach to solve the deferred probe Frank Rowand <frowand.list@gmail.com> - 2015-10-21 06:00 +0200
                Re: Alternative approach to solve the deferred probe Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-21 10:20 +0200
                Re: Alternative approach to solve the deferred probe Frank Rowand <frowand.list@gmail.com> - 2015-10-21 17:40 +0200
                Re: Alternative approach to solve the deferred probe Grygorii Strashko <grygorii.strashko@ti.com> - 2015-10-21 19:00 +0200
                Re: Alternative approach to solve the deferred probe Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-21 19:30 +0200
                Re: Alternative approach to solve the deferred probe Grygorii Strashko <grygorii.strashko@ti.com> - 2015-10-21 20:20 +0200
                Re: Alternative approach to solve the deferred probe Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-21 20:30 +0200
                Re: Alternative approach to solve the deferred probe Grygorii Strashko <grygorii.strashko@ti.com> - 2015-10-22 17:20 +0200
                Re: Alternative approach to solve the deferred probe Frank Rowand <frowand.list@gmail.com> - 2015-10-21 20:10 +0200
                Re: Alternative approach to solve the deferred probe Grygorii Strashko <grygorii.strashko@ti.com> - 2015-10-21 20:40 +0200
                Re: Alternative approach to solve the deferred probe Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-21 22:40 +0200
                Re: Alternative approach to solve the deferred probe Frank Rowand <frowand.list@gmail.com> - 2015-10-22 02:10 +0200
                Re: Alternative approach to solve the deferred probe (was: [GIT  PULL] On-demand device probing) Mark Brown <broonie@kernel.org> - 2015-10-23 01:40 +0200
        Re: [GIT PULL] On-demand device probing Frank Rowand <frowand.list@gmail.com> - 2015-10-21 18:10 +0200
          Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-21 18:30 +0200
            Re: [GIT PULL] On-demand device probing Frank Rowand <frowand.list@gmail.com> - 2015-10-21 20:30 +0200
              Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-21 23:10 +0200
              Re: [GIT PULL] On-demand device probing Rob Herring <robh+dt@kernel.org> - 2015-10-21 23:20 +0200
                Re: [GIT PULL] On-demand device probing Frank Rowand <frowand.list@gmail.com> - 2015-10-22 00:00 +0200
                Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-22 11:10 +0200
                Re: [GIT PULL] On-demand device probing Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-22 16:40 +0200
                Re: [GIT PULL] On-demand device probing Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-22 16:50 +0200
                Re: [GIT PULL] On-demand device probing Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-10-22 17:10 +0200
                Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-23 01:40 +0200
                Re: [GIT PULL] On-demand device probing Frank Rowand <frowand.list@gmail.com> - 2015-10-22 21:00 +0200
                Re: [GIT PULL] On-demand device probing Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-10-22 21:30 +0200
                Re: [GIT PULL] On-demand device probing Tim Bird <tim.bird@sonymobile.com> - 2015-10-23 17:50 +0200
                Re: [GIT PULL] On-demand device probing Rob Herring <robh+dt@kernel.org> - 2015-10-23 18:40 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-24 15:50 +0200
                Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-25 00:10 +0200
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rafael@kernel.org> - 2015-10-25 15:00 +0100
                Re: [GIT PULL] On-demand device probing Mark Brown <broonie@kernel.org> - 2015-10-26 02:20 +0100
                Re: [GIT PULL] On-demand device probing Michael Turquette <mturquette@baylibre.com> - 2015-10-26 12:00 +0100
                Re: [GIT PULL] On-demand device probing Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-26 14:00 +0100
                Re: [GIT PULL] On-demand device probing "Rafael J. Wysocki" <rafael@kernel.org> - 2015-10-27 00:40 +0100
                Re: [GIT PULL] On-demand device probing "Andrew F. Davis" <afd@ti.com> - 2015-10-25 20:50 +0100
                Re: [GIT PULL] On-demand device probing Geert Uytterhoeven <geert@linux-m68k.org> - 2015-10-24 20:00 +0200

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