[PATCHSET] libata: add @disable_on_err to ata_set_mode(), take#2

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Hello, all.

This is the second take of add-disable_on_err-to-ata_set_mode
patchset.  Changes from the last take[1] are...

* a new patch check-disable-after-internal-cmd is added.  This makes
  ata_exec_internal() to check whether LLDD disabled the port after an
  internal command and handle the situation.  This change allows upper
  layers to operate under the assumption that lower layer does not
  diddle with port/device enable status.  Note that this is a
  temporary measure, to be removed once all LLDDs are updated to the
  new API.

This patchset is against
current upstream[2]
+ implement-per-dev-xfer-masks patchset, take#2 [3]

Thanks.

--
tejun

[1] http://article.gmane.org/gmane.linux.ide/8754
[2] 2cc432eed0491df66e14b578139bba2c75fb3f9a
[3] http://article.gmane.org/gmane.linux.ide/9001


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