linux-kernel - Re: [Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1

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Message-Id: <20110428233538V.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 28 Apr 2011 23:38:07 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	arnd@...db.de
Cc:	linux@....linux.org.uk, fujita.tomonori@....ntt.co.jp,
	m.szyprowski@...sung.com, benh@...nel.crashing.org,
	linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1

I'm busy at a conference so I've not read the whole thread yet..

On Thu, 28 Apr 2011 16:29:52 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> I was mistaken there: all drivers that use dma_alloc_noncoherent
> either use dma_cache_sync() or they do something that is more broken,
> but they don't do dma_sync_*.

As the DMA-API.txt says, dma_alloc_noncoherent should be used with
dma_cache_sync(). You shouldn't use dma_sync* API with a memory
returned by dma_alloc_noncoherent().
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