linux-kernel - Re: [PATCH v4 01/22] driver core: Add pre_probe callback to bus

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Message-ID: <20150911120408.GO12027@sirena.org.uk>
Date:	Fri, 11 Sep 2015 13:04:08 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-arm-kernel@...ts.infradead.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	devicetree@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-acpi@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v4 01/22] driver core: Add pre_probe callback to bus_type

On Mon, Sep 07, 2015 at 02:23:26PM +0200, Tomeu Vizoso wrote:

> +	if (dev->bus && dev->bus->pre_probe) {
> +		ret = dev->bus->pre_probe(dev);
> +		if (ret) {
> +			if (ret == -EPROBE_DEFER)
> +				driver_deferred_probe_add(dev);
> +			ret = 0;
> +			goto out_unlock;
> +		}
> +	}

So if we get an error other than -EPROBE_DEFER we silently ignore it?
That seems surprising and at least worth a comment.

> +	if (dev->bus && dev->bus->pre_probe) {
> +		ret = dev->bus->pre_probe(dev);
> +		if (ret) {
> +			if (ret == -EPROBE_DEFER)
> +				driver_deferred_probe_add(dev);
> +			goto out;
> +		}
> +	}

That's more what I'd expect.

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