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From: John Stultz <john.stultz@linaro.org>
To: lkml <linux-kernel@vger.kernel.org>
Cc: Rob Herring <robh@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Kevin Hilman <khilman@kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>, Pavel Machek <pavel@ucw.cz>,
	Len Brown <len.brown@intel.com>, Todd Kjos <tkjos@google.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Linux PM list <linux-pm@vger.kernel.org>
Subject: Re: [PATCH v2] driver core: Extend returning EPROBE_DEFER for two minutes after late_initcall
Date: Fri, 14 Feb 2020 15:34:11 -0800
Message-ID: <CALAqxLVukbQETMSfjc3OsEE4BGt-uXxw-NTqgLxA=ja4JAVD4w@mail.gmail.com> (raw)
In-Reply-To: <20200214233226.82096-1-john.stultz@linaro.org>

On Fri, Feb 14, 2020 at 3:32 PM John Stultz <john.stultz@linaro.org> wrote:
>
> Due to commit e01afc3250255 ("PM / Domains: Stop deferring probe
> at the end of initcall"), along with commit 25b4e70dcce9
> ("driver core: allow stopping deferred probe after init") after
> late_initcall, drivers will stop getting EPROBE_DEFER, and
> instead see an error causing the driver to fail to load.
>
> That change causes trouble when trying to use many clk drivers
> as modules, as the clk modules may not load until much later
> after init has started. If a dependent driver loads and gets an
> error instead of EPROBE_DEFER, it won't try to reload later when
> the dependency is met, and will thus fail to load.
>
> Instead of reverting that patch, this patch tries to extend the
> time that EPROBE_DEFER is retruned by 30 seconds, to (hopefully)
> ensure that everything has had a chance to load.

Oh, and of course I forgot to fix the subject line and didn't see it
until git send-email was done.  That should be 30 seconds, not two
minutes. I'll fix that up for the next version.

Apologies!
-john

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 23:32 John Stultz
2020-02-14 23:34 ` John Stultz [this message]
2020-02-15  7:51 ` Bjorn Andersson
2020-02-15 21:32 ` Rob Herring

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