linux-kernel - Re: [PATCH 2/2 v2] Blackfin: fix dma-mapping build errors

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Date:	Tue, 23 Jun 2009 10:40:46 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Mike Frysinger <vapier@...too.org>
Cc:	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: Re: [PATCH 2/2 v2] Blackfin: fix dma-mapping build errors

On Tuesday 23 June 2009, Mike Frysinger wrote:

> +static inline void dma_sync_sg_for_device(struct device *dev,
> +					struct scatterlist *sg,
> +					int nents, enum dma_data_direction dir)
> +{
> +}

If you flush the dcache in dma_map_sg, you probably also need to
flush it in dma_sync_*_for_device:

static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
                      int nents, enum dma_data_direction direction)
{
       struct scatterlist *sg;
       int i;

       for_each_sg(sglist, sg, nents, i)
               invalidate_dcache_range(sg_virt(sg), sg_virt(sg) + sg->length);
}

	Arnd <><
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