This reverts commit 5491d0f3e2.
As per Andi:
"After some discussion with people who have the affected system it
seems best to revert for 2.6.17. It broke a common BIOS workaround
and PCI-X still doesn't work. Alternative is for people to change
the BIOS which seems to be better right now."
Signed-off-by: Linus Torvalds <torvalds@osdl.org>