sata_nv: convert to new EH and add hotplug support, take 2

Hello,

This is the second take of convert-sata_nv-to-new-EH patchset.
Changes from the last take[1] are...

* controllers are differentiated by standard port_info/poert_ops
  instead of nv_host/host_desc

* thaw() fixed such that only the affected port's irq status is
  cleared.

I've tested it on ASUS A8N-E (nForce4, CK804, 10de:0054), and
everything works fine.  However, the controller doesn't have
protection against data transfer hang (IORDY hang) and the machine
completely locks up if a device is removed during active data
transfer.  I don't think it can be worked around without using the
better interface (ADMA).

This patchset contains 6 patches.

#01-03: prep sata_nv
#04   : improve irq handler
#05   : implement new EH
#06   : add hotplug support

This patchset is against

     upstream (db9ca5803566078aafe63cf364ef98b5097e4194)

Thanks.

--
tejun

[1] http://article.gmane.org/gmane.linux.ide/11381


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