linux-kernel - Re: [PATCH v8 08/19] arm/xen: get_dma_ops: return xen_dma_ops if we are running as xen_initial

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Message-ID: <20131018154246.GB25034@n2100.arm.linux.org.uk>
Date:	Fri, 18 Oct 2013 16:42:46 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, konrad.wilk@...cle.com,
	Ian.Campbell@...rix.com, will.deacon@....com
Subject: Re: [PATCH v8 08/19] arm/xen: get_dma_ops: return xen_dma_ops if
	we are running as xen_initial_domain

On Fri, Oct 18, 2013 at 01:22:18PM +0100, Stefano Stabellini wrote:
> Russell,
> are you OK with this patch?

Only concern is why the change is soo large.

> > -static inline struct dma_map_ops *get_dma_ops(struct device *dev)
> > +static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
> >  {
> >  	if (dev && dev->archdata.dma_ops)
> >  		return dev->archdata.dma_ops;
> >  	return &arm_dma_ops;
> >  }
> >  
> > +static inline struct dma_map_ops *get_dma_ops(struct device *dev)
> > +{
> > +	if (xen_initial_domain())
> > +		return xen_dma_ops;
> > +	else
> > +		return __generic_dma_ops(dev);
> > +}
> > +

What's wrong with:

 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 {
+	if (xen_initial_domain())
+		return xen_dma_ops;
 	if (dev && dev->archdata.dma_ops)
 		return dev->archdata.dma_ops;
 	return &arm_dma_ops;
 }

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