linux-kernel - Re: [V4 PATCH 3/6] pci: Generic function for setting up PCI device DMA coherency

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Message-ID: <2072233.lIH4idDurI@wuerfel>
Date:	Wed, 20 May 2015 11:27:54 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linaro-acpi@...ts.linaro.org, will.deacon@....com,
	herbert@...dor.apana.org.au, al.stone@...aro.org,
	linux-acpi@...r.kernel.org, Murali Karicheri <m-karicheri2@...com>,
	msalter@...hat.com, grant.likely@...aro.org, lenb@...nel.org,
	thomas.lendacky@....com, linux-crypto@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>, bhelgaas@...gle.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	leo.duran@....com, hanjun.guo@...aro.org,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	David Woodhouse <dwmw2@...radead.org>, davem@...emloft.net
Subject: Re: [V4 PATCH 3/6] pci: Generic function for setting up PCI device DMA coherency

On Wednesday 20 May 2015 10:24:15 Catalin Marinas wrote:
> On Sat, May 16, 2015 at 01:59:00AM +0200, Rafael J. Wysocki wrote:
> > On Friday, May 15, 2015 04:23:11 PM Suravee Suthikulpanit wrote:
> > > +/**
> > > + * pci_dma_configure - Setup DMA configuration
> > > + * @pci_dev: ptr to pci_dev struct of the PCI device
> > > + *
> > > + * Function to update PCI devices's DMA configuration using the same
> > > + * info from the OF node or ACPI node of host bridge's parent (if any).
> > > + */
> > > +static void pci_dma_configure(struct pci_dev *pci_dev)
> > > +{
> > > +   struct device *dev = &pci_dev->dev;
> > > +   struct device *bridge = pci_get_host_bridge_device(pci_dev);
> > > +   struct device *host = bridge->parent;
> > > +   struct acpi_device *adev;
> > > +
> > > +   if (!host)
> > > +           return;
> > > +
> > > +   if (acpi_disabled) {
> > > +           of_dma_configure(dev, host->of_node);
> > 
> > I'd rather do
> > 
> >       if (IS_ENABLED(CONFIG_OF) && host->of_node) {
> >               of_dma_configure(dev, host->of_node);
> 
> Nitpick: do we need the CONFIG_OF check? If disabled, I don't think
> anyone would set host->of_node.
> 

If of_dma_configure() is defined in a file that is built conditionally
based on CONFIG_OF, you need it.

	Arnd
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