linux-kernel - Re: [Linaro-acpi] [RFC PATCH for Juno 1/2] net: smsc911x add support for probing from ACPI

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Date:	Mon, 01 Sep 2014 17:17:51 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linaro-acpi@...ts.linaro.org
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <mark.rutland@....com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Robert Moore <robert.moore@...el.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linaro-acpi] [RFC PATCH for Juno 1/2] net: smsc911x add support for probing from ACPI

On Monday 01 September 2014 23:06:00 Hanjun Guo wrote:
> +#ifdef CONFIG_ACPI
> +/* Configure some sensible defaults for ACPI mode */
> +static int smsc911x_probe_config_acpi(struct smsc911x_platform_config *config,
> +                                   acpi_handle *ahandle)
> +{
> +       if (!ahandle)
> +               return -ENOSYS;
> +
> +       config->phy_interface = PHY_INTERFACE_MODE_MII;
> 

Please remove the #ifdef and use 

	if (!IS_ENABLED(CONFIG_ACPI) || !ahandle)

to check for ACPI support. This should result in the same object code
in all cases, but give better compile-time coverage when ACPI is
disabled.

Also, -ENOSYS is probably the wrong return value. I think you mean
-ENXIO.

	Arnd
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