powerpc: Add proper reference to dma_mask

[Benjamin Herrenschmidt]

On Tue, 2008-07-08 at 13:54 +1000, Stephen Rothwell wrote:
> Hi Vitaly,
> 
> On Tue, 8 Jul 2008 03:12:56 +0400 Vitaly Bordug <vitb at kernel.crashing.org> wrote:
> >
> > +++ b/arch/powerpc/kernel/of_platform.c
> > @@ -76,6 +76,9 @@ struct of_device* of_platform_device_create(struct device_node *np,
> >  		return NULL;
> >  
> >  	dev->dma_mask = 0xffffffffUL;
> > +	dev->dev.dma_mask = &dev->dma_mask;
> 
> That is done in of_device_alloc which is called just above.

So the problem might just be that coherent_dma_mask isn't set.

Ben.