On a board containing the HPT372N IDE controller the 2.6.x series kernels will
misbehave. If the HPT372N is set up with the newer PCI identifier it is 
ignored. If it is set up with the HPT372 identifier then the kernel crashes
on boot.

This patch is a forward port of my 2.4 driver fixes that have been in 2.4
for a year but somehow escaped 2.6. Ronny Buchmann caught a couple
of merge details I missed and those are fixed in this diff too.

As well as adding 372N support this also fixes the unknown revision case
to avoid crashes should any future 37x variants with weird class_rev's appear
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>