From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 2 Dec 2008 19:16:03 +0000 (+0100)
Subject: x86: fix broken flushing in GART nofullflush path
X-Git-Tag: v2.6.28-rc8~58^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70d7d357578245f1993fd2d3ccd26088bcd38941;p=pandora-kernel.git

x86: fix broken flushing in GART nofullflush path

Impact: remove stale IOTLB entries

In the non-default nofullflush case the GART is only flushed when
next_bit wraps around. But it can happen that an unmap operation unmaps
memory which is behind the current next_bit location. If these addresses
are reused it may result in stale GART IO/TLB entries. Fix this by
setting the GART next_bit always behind an unmapped location.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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