libata: reorganize configuration and implement revalidation

Hello, again.

This patchset is against

upstream-2.6.17 (7db74a4780cf9cc6b2ea97582cdc8031d5f22ccd)
 + various fixes related to EH patchset [1]
 + three AHCI updates [2][3][4]
 + new reset mechanism patchset [5]
 + fixes regarding configuration patchset [6]

This patchset is consisted of 16 patches and can be categorized into
the following three parts.

#01-07		: prepare for ata_dev_identify() reorganization
#08-12		: reorganize ata_dev_identify() into ata_dev_read_id()
		  and ata_dev_configure()
#13-16		: implement and use revalidation using ata_dev_read_id()
		  and ata_dev_configure()

Also, please pay attention to the following.  It's taken from #08's
description.

  This function is probably the place to set transfer mode to PIO0
  before IDENTIFY.  However, reset -> identify -> init_dev_params
  order should be kept for pre-ATA4 devices so we cannot set transfer
  mode before IDENTIFY for them.  How do we know if a device is
  post-ATA4 before IDENTIFY?

How should we do this?  Ignore pre-ATA4 devices?

Thanks.

--
tejun

[1] http://marc.theaimsgroup.com/?l=linux-ide&m=113798939...
[2] http://marc.theaimsgroup.com/?l=linux-ide&m=113800194...
[3] http://marc.theaimsgroup.com/?l=linux-ide&m=113800459...
[4] http://marc.theaimsgroup.com/?l=linux-ide&m=113804195...
[5] http://marc.theaimsgroup.com/?l=linux-ide&m=113809002...
[6] http://marc.theaimsgroup.com/?l=linux-ide&m=113828912...


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