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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