Re: [PATCH #upstream 1/3] libata: beef up iterators

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Tejun Heo wrote:
There currently are the following looping constructs.

* __ata_port_for_each_link() for all available links
* ata_port_for_each_link() for edge links
* ata_link_for_each_dev() for all devices
* ata_link_for_each_dev_reverse() for all devices in reverse order

Now there's a need for looping construct which is similar to
__ata_port_for_each_link() but iterates over PMP links before the host
link.  Instead of adding another one with long name, do the following
cleanup.

* Implement and export ata_link_next() and ata_dev_next() which take
  @mode parameter and can be used to build custom loop.
* Implement ata_for_each_link() and ata_for_each_dev() which take
  looping mode explicitly.

The following iteration modes are implemented.

* ATA_LITER_EDGE		: loop over edge links
* ATA_LITER_HOST_FIRST		: loop over all links, host link first
* ATA_LITER_PMP_FIRST		: loop over all links, PMP links first

* ATA_DITER_ENABLED		: loop over enabled devices
* ATA_DITER_ENABLED_REVERSE	: loop over enabled devices in reverse order
* ATA_DITER_ALL			: loop over all devices
* ATA_DITER_ALL_REVERSE		: loop over all devices in reverse order

This change removes exlicit device enabledness checks from many loops
and makes it clear which ones are iterated over in which direction.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
---
Comments added and retargeted for #upstream.

This patchset is on top of

#upstream-fixes (9ce8e3073d9cfd6f859c22a25441db41b85cbf6e)
+ [1] patches-which-fell-off-the-crack-during-maintainership-handover patchset
+ [2] mask-off-DET-when-restoring-SControl-for-detach

[1] http://thread.gmane.org/gmane.linux.ide/35783
[2] http://article.gmane.org/gmane.linux.ide/35792

applied to newly created #upstream (on top of just-sent #upstream-fixes)


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