From: Catalin Marinas <catalin.marinas@arm.com>
Date: Mon, 21 Jun 2010 14:09:36 +0000 (+0100)
Subject: ARM: 6187/1: The v6_dma_inv_range() function must preserve data on SMP
X-Git-Tag: v2.6.35-rc4~1^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca57926d53580f7c950496cb7ef6d7930610e1dd;p=pandora-kernel.git

ARM: 6187/1: The v6_dma_inv_range() function must preserve data on SMP

A recent patch for DMA cache maintenance on ARM11MPCore added a write
for ownership trick to the v6_dma_inv_range() function. Such operation
destroys data already present in the buffer. However, this function is
used with with dma_sync_single_for_device() which is supposed to
preserve the existing data transfered into the buffer. This patch adds a
combination of read/write for ownership to preserve the original data.

Reported-by: Ronen Shitrit <rshitrit@marvell.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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