linux-kernel - Re: [PATCH v2] dmaengine: care sd_dma_address/len in dmaengine_prep_slave

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Message-ID: <20120201182201.GE889@n2100.arm.linux.org.uk>
Date:	Wed, 1 Feb 2012 18:22:01 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dmaengine: care sd_dma_address/len in
	dmaengine_prep_slave_single()

On Mon, Jan 30, 2012 at 05:13:30PM -0800, Kuninori Morimoto wrote:
> +	sg_init_table(&sg, 1);
> +	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf)),
> +		    len, offset_in_page(buf));

There's not much point setting this - the page/virtual address should
not be used by DMA engines as that may not reflect what's being requested
(especially if there's an IOMMU in the way.)
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