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

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Date:	Tue, 23 Jun 2009 11:14:22 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	vapier@...too.org
Cc:	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH 2/2] Blackfin: fix dma-mapping build errors

On Mon, 22 Jun 2009 21:54:46 -0400
Mike Frysinger <vapier@...too.org> wrote:

> The recent deprecation of dma_sync_{sg,single} ironically broke Blackfin
> systems.

Oops, sorry about that.


> This is because we don't define dma_sync_sg_for_cpu at all, so
> until the DMA asm-generic conversion/cleanup is done after the next
> release, simply redirect the dma_sync_sg_for_cpu to the debug version.

This doesn't look correct (though it works). dma-debug.h is supposed
to be used by architectures that support DMA_API_DEBUG feature
(blackfin doesn't support it). dma_sync_sg_for_cpu is not the
debug version of dma_sync_sg_for_cpu.

I think that simply adding dummy dma_sync_single_for_device() is a
proper solution (as blackfin already does wrt dma_sync_single_for_cpu
and dma_sync_single_for_device).

Architectures are also supposed to have dma_sync_sg_for_cpu and
dma_sync_sg_for_device, so let's add both.


diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
index d7d9148..6997836 100644
--- a/arch/blackfin/include/asm/dma-mapping.h
+++ b/arch/blackfin/include/asm/dma-mapping.h
@@ -95,4 +95,17 @@ static inline void dma_sync_single_for_device(struct device *dev,
 					enum dma_data_direction dir)
 {
 }
+
+static inline void dma_sync_sg_for_cpu(struct device *dev,
+				       struct scatterlist *sg,
+				       int nents, enum dma_data_direction dir)
+{
+}
+
+static inline void dma_sync_sg_for_device(struct device *dev,
+					  struct scatterlist *sg,
+					  int nents, enum dma_data_direction dir)
+{
+}
+
 #endif				/* _BLACKFIN_DMA_MAPPING_H */
--
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