libata: prep for PMP support, take 6

Hello, all.

This is the sixth take of libata-pmp-prep patchset.  This patchset
contains 12 patches implementing various stuff needed for PMP.

#01-04	: various small stuff
#05-06	: qc_defer mechanism implementation
#07-11	: link/device quirks and EH fast-fail path - things needed to
	  handle quirky PMP fan-out links / pseudo devices.
#12	: AN demultiplexer - sata_async_notification()

Change from the last take[L] are...

* Updated to handle both ATAPI AN and PMP AN as ATAPI AN has been
  merged inbetween.  This is done by adding new patch #01 and updating
  patch #12.

This patchset is against

  libata-dev#upstream (b56feca2ede0dd11a8409743ff14cf14cbcf5062)
  + [1] sata_sil24-fix-IRQ-clearing-race-when-PCIX_IRQ_WOC-is-used

Thanks.

--
tejun

[L] http://thread.gmane.org/gmane.linux.ide/20857
[1] http://article.gmane.org/gmane.linux.ide/22918 


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