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

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Message-ID: <20140901170259.GK2953@xora-haswell.xora.org.uk>
Date:	Mon, 1 Sep 2014 18:03:00 +0100
From:	Graeme Gregory <gg@...mlogic.co.uk>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Graeme Gregory <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Rob Herring <robh@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Robert Moore <robert.moore@...el.com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Olof Johansson <olof@...om.net>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Lv Zheng <lv.zheng@...el.com>
Subject: Re: [Linaro-acpi] [RFC PATCH for Juno 1/2] net: smsc911x add support
 for probing from ACPI

On Mon, Sep 01, 2014 at 05:53:33PM +0100, Catalin Marinas wrote:
> On Mon, Sep 01, 2014 at 04:28:54PM +0100, Graeme Gregory wrote:
> > On Mon, Sep 01, 2014 at 05:17:51PM +0200, Arnd Bergmann wrote:
> > > 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.
> > > 
> > struct acpi_handle does not exist in the case !CONFIG_ACPI
> 
> Confused. Then how come smsc911x_drv_probe() has this line:
> 
> 	acpi_handle *ahandle = ACPI_HANDLE(&pdev->dev);
> 
> without any #ifdef's.
> 
It is possible I confused myself as some types moved around in ACPI
recently. I will re-check!

Graeme

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