2.6.34-rc2 breaks via82cxxx Host Protected Area

[David Fries]

The kernel fails to see the entire disk with 2.6.34-rc2 with VIA
vt82c586b chipset.  I tracked it down to commit
f931a5d5785d7b7c44871bd7ad2762e29dfddf29 "via82cxxx: workaround h/w
bugs" and reverting just that one solves the problem, or just
commenting out just one outb write in that change.

via82cxxx 0000:00:07.1: VIA vt82c586b (rev 41) IDE UDMA33
via82cxxx 0000:00:07.1: IDE controller (0x1106:0x0571 rev 0x06)
via82cxxx 0000:00:07.1: not 100% native mode: will probe irqs later

Note the kernel panic is intentional as I'm given the test kernel an
invalid root device, so that I can suspend to disk, try a kernel,
resume and pick up where I left off.  It does have a side benefit of
dumping the size of all partitions.

2.6.34-rc2 unmodified, fails and sees 30985416 KiB for the last
partition.
ide-gd driver 1.18
hda: max request size: 128KiB
hda: 66055248 sectors (33820 MB) w/7936KiB Cache, CHS=65531/16/63
hda: cache flushes supported
 hda: hda1 hda2 hda3
hda: p3 size 236037312 exceeds device capacity, enabling native capacity
hda: p3 size 236037312 exceeds device capacity, limited to end of disk
ide-cd driver 5.00
...
Please append a correct "root=" boot option; here are the available partitions:
0300        33027624 hda driver: ide-gd
  0301           49391 hda1
  0302         1992816 hda2
  0303        30985416 hda3
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(22,2)

2.6.34-rc2 with patch revered, correct size 118018656
ide-gd driver 1.18
hda: max request size: 128KiB
hda: Host Protected Area detected.
        current capacity is 66055248 sectors (33820 MB)
        native  capacity is 240121728 sectors (122942 MB)
hda: 66055248 sectors (33820 MB) w/7936KiB Cache, CHS=65531/16/63
hda: cache flushes supported
 hda: hda1 hda2 hda3
hda: p3 size 236037312 exceeds device capacity, enabling native capacity
hda: detected capacity change from 33820286976 to 122942324736
ide-cd driver 5.00
0300       120060864 hda driver: ide-gd
  0301           49391 hda1
  0302         1992816 hda2
  0303       118018656 hda3
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(22,2)

Here are two debug patches, the first adds debug prints and the second
disables the problematic write, I  have the output of both included.