linux-kernel - Re: [PATCH v3 2/4] of: move of_dma_configure() to device,c to help re-use

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Date:	Thu, 08 Jan 2015 09:40:10 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robherring2@...il.com>
Cc:	Murali Karicheri <m-karicheri2@...com>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v3 2/4] of: move of_dma_configure() to device,c to help re-use

On Wednesday 07 January 2015 17:37:56 Rob Herring wrote:
> On Wed, Jan 7, 2015 at 12:49 PM, Murali Karicheri <m-karicheri2@...com> wrote:
> 
> > +       ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
> > +       if (ret < 0) {
> > +               dma_addr = offset = 0;
> > +               size = dev->coherent_dma_mask + 1;
> 
> If coherent_dma_mask is DMA_BIT_MASK(64), then you will overflow and
> have a size of 0. There may also be a problem when the mask is only
> 32-bit type.

The mask is always a 64-bit type, it's not optional. But you are right,
the 64-bit mask case is broken, so I guess we have to fix it differently
by always passing the smaller value into arch_setup_dma_ops and
adapting that function instead.

	Arnd
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