From: David Miller <davem@davemloft.net>
Date: Thu, 12 Feb 2009 10:15:27 +0000 (-0800)
Subject: drm: ati_pcigart: Do not access I/O MEM space using pointer derefs.
X-Git-Tag: v2.6.30-rc1~613^2~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a7aad9a559a5488cbef7aa3d4d96fc28220b8ae;p=pandora-kernel.git

drm: ati_pcigart: Do not access I/O MEM space using pointer derefs.

The PCI GART table initialization code treats the GART table mapping
unconditionally as a kernel virtual address.

But it could be in the framebuffer, for example, and thus we're
dealing with a PCI MEM space ioremap() cookie.  Treating that as a
virtual address is illegal and will crash some system types (such as
sparc64 where the ioremap() return value is actually a physical I/O
address).

So access the area correctly, using gart_info->gart_table_location as
our guide.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
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