Re: [isci PATCH v3 1/4] libata: export ata_port suspend/resume infrastructure for sas

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On 03/14/2012 03:13 AM, Dan Williams wrote:
Reuse ata_port_{suspend|resume}_common for sas.  This path is chosen
over adding coordination between ata-tranport and sas-transport because
libsas wants to revalidate the domain at resume-time at the host level.
It can not validate links have resumed properly until libata has had a
chance to perform its revalidation, and any sane placing of an ata_port
in the sas-transport model would delay it's resumption until after the
host.

Export the common portion of port suspend/resume (bypass pm_runtime),
and allow sas to perform these operations asynchronously (similar to the
libsas async-ata probe implmentation).  Async operation is determined by
having an external, rather than stack based, location for storing the
result of the operation.

Reviewed-by: Jacek Danecki<jacek.danecki@xxxxxxxxx>
Signed-off-by: Dan Williams<dan.j.williams@xxxxxxxxx>
---
  drivers/ata/libata-core.c |   58 ++++++++++++++++++++++++++++++++++++---------
  include/linux/libata.h    |   11 +++++++++
  2 files changed, 57 insertions(+), 12 deletions(-)

Now that libata's runtime PM problems seem to be fixed for the moment, we can revisit port PM here. Just checking... Is this patch still needed?



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