[SRU][Xenial][PATCH 0/4] Fixes for LP:1693369

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1693369

== SRU Justification ==
This bug is resolved by commits 62e62ffd95539b9220894a7900a619e0f3ef4756 and
commit 9373eba6cfae48911b977d14323032cd5d161aae.  The first commit, 62e62ffd95,
was already applied to Xenial with the 4.4.79 updates.

Without these patches, the symlink in sysfs which binds a SAS device to an enclosure 
slot does not get created. This makes disk hotplug near impossible on large 
JBOD disk drawers.

There are three prereq commits in order to apply commit 9373eba6c to Xenial.  Those
commits are listed in the 'Fixes' section of this SRU request.

This fix is also needed in Zesty, but that SRU was sent separately because Zesty
required only commit 62e62ffd95.


== Fixes ==
Prereq:
commit bcf508c13385e74972f5cc06d8471d5c100395b0
Author: James Bottomley <James.Bottomley at HansenPartnership.com>
Date:   Wed Dec 9 11:13:35 2015 -0800

    scsi_transport_sas: add function to get SAS endpoint address

Prereq:
commit 3f8d6f2a0797e8c650a47e5c1b5c2601a46f4293
Author: James Bottomley <James.Bottomley at HansenPartnership.com>
Date:   Wed Dec 9 12:56:07 2015 -0800

    ses: fix discovery of SATA devices in SAS enclosures

Prereq:
commit c1a23f6d64552b4480208aa584ec7e9c13d6d9c3
Author: Johannes Thumshirn <jthumshirn at suse.de>
Date:   Wed Aug 17 11:46:16 2016 +0200

    scsi: sas: provide stub implementation for scsi_is_sas_rphy
    
Real fix:
commit 9373eba6cfae48911b977d14323032cd5d161aae
Author: Ewan D. Milne <emilne at redhat.com>
Date:   Mon Jan 9 16:33:36 2017 -0500

    scsi: ses: Fix SAS device detection in enclosure


== Regression Potential ==
There are four required patchs, so there is a medium regression potention.  However,
the patch set was tested by IBM and confirmed to resolve the bug without causing
other issues. 

== Test Case ==
A test kernel was built with these patches and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Ewan D. Milne (1):
  scsi: ses: Fix SAS device detection in enclosure

James Bottomley (2):
  scsi_transport_sas: add function to get SAS endpoint address
  ses: fix discovery of SATA devices in SAS enclosures

Johannes Thumshirn (1):
  scsi: sas: provide stub implementation for scsi_is_sas_rphy

 drivers/scsi/Kconfig              |  1 +
 drivers/scsi/scsi_transport_sas.c | 14 ++++++++++++++
 drivers/scsi/ses.c                | 22 ++++------------------
 include/scsi/scsi_transport_sas.h | 17 ++++++++++++++++-
 4 files changed, 35 insertions(+), 19 deletions(-)

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2.7.4