From: Wolfgang Muees <wolfgang.mues@auerswald.de>
Date: Fri, 5 Mar 2010 21:43:40 +0000 (-0800)
Subject: mmc: at91_mci: use one coherent DMA buffer
X-Git-Tag: v2.6.34-rc1~79
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3780d90602dfef6df3d8b39b203d6bf7fb99f22a;p=pandora-kernel.git

mmc: at91_mci: use one coherent DMA buffer

The TX DMA buffer is allocated only once, because the
allocation/deallocation of the buffer for EACH chunk of data is
time-consuming and prone to memory fragmentation.

Using a coherent DMA buffer avoids extra data cache calls.

[nicolas.ferre@atmel.com: coding style modifications]
Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Andrew Victor <avictor.za@gmail.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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