linux-kernel - [PATCH][RFC] asm-generic:remove calling flush_write_buffers() in dma_sync_*_for

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Message-Id: <1246199959-6548-1-git-send-email-tom.leiming@gmail.com>
Date:	Sun, 28 Jun 2009 22:39:19 +0800
From:	tom.leiming@...il.com
To:	joerg.roedel@....com, fujita.tomonori@....ntt.co.jp
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Ming Lei <tom.leiming@...il.com>
Subject: [PATCH][RFC] asm-generic:remove calling flush_write_buffers() in dma_sync_*_for_cpu

From: Ming Lei <tom.leiming@...il.com>

dma_sync_*_for_cpu() is introduced to make cpu access dma buffers safely when
dma transfer is over, it seems there is nothing to do with cpu write buffer,
so remove it.

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 include/asm-generic/dma-mapping-common.h |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
index 5406a60..73411ab 100644
--- a/include/asm-generic/dma-mapping-common.h
+++ b/include/asm-generic/dma-mapping-common.h
@@ -103,7 +103,6 @@ static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 	if (ops->sync_single_for_cpu)
 		ops->sync_single_for_cpu(dev, addr, size, dir);
 	debug_dma_sync_single_for_cpu(dev, addr, size, dir);
-	flush_write_buffers();
 }
 
 static inline void dma_sync_single_for_device(struct device *dev,
@@ -132,7 +131,6 @@ static inline void dma_sync_single_range_for_cpu(struct device *dev,
 		ops->sync_single_range_for_cpu(dev, addr, offset, size, dir);
 		debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
 
-		flush_write_buffers();
 	} else
 		dma_sync_single_for_cpu(dev, addr, size, dir);
 }
@@ -165,7 +163,6 @@ dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 	if (ops->sync_sg_for_cpu)
 		ops->sync_sg_for_cpu(dev, sg, nelems, dir);
 	debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
-	flush_write_buffers();
 }
 
 static inline void
-- 
1.6.0.GIT

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