linux-kernel - Re: [PATCH v2 1/8] driver core: make deferring probe after init optional

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Message-ID: <20180524185639.GA31019@kroah.com>
Date:   Thu, 24 May 2018 20:56:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexander Graf <agraf@...e.de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Mark Brown <broonie@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        boot-architecture@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/8] driver core: make deferring probe after init
 optional

On Thu, May 24, 2018 at 12:50:17PM -0500, Rob Herring wrote:
> Deferred probe will currently wait forever on dependent devices to probe,
> but sometimes a driver will never exist. It's also not always critical for
> a driver to exist. Platforms can rely on default configuration from the
> bootloader or reset defaults for things such as pinctrl and power domains.
> This is often the case with initial platform support until various drivers
> get enabled. There's at least 2 scenarios where deferred probe can render
> a platform broken. Both involve using a DT which has more devices and
> dependencies than the kernel supports. The 1st case is a driver may be
> disabled in the kernel config. The 2nd case is the kernel version may
> simply not have the dependent driver. This can happen if using a newer DT
> (provided by firmware perhaps) with a stable kernel version.
> 
> Subsystems or drivers may opt-in to this behavior by calling
> driver_deferred_probe_check_init_done() instead of just returning
> -EPROBE_DEFER. They may use additional information from DT or kernel's
> config to decide whether to continue to defer probe or not.
> 
> Cc: Alexander Graf <agraf@...e.de>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/base/dd.c      | 17 +++++++++++++++++
>  include/linux/device.h |  2 ++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index c9f54089429b..d6034718da6f 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -226,6 +226,16 @@ void device_unblock_probing(void)
>  	driver_deferred_probe_trigger();
>  }
>  
> +int driver_deferred_probe_check_init_done(struct device *dev, bool optional)
> +{
> +	if (optional && initcalls_done) {
> +		dev_WARN(dev, "ignoring dependency for device, assuming no driver");

You really only need dev_warn(), here, right?

thanks,

greg k-h