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[Manoj Iyer <1693369@xxxxxxxxxxxxxxxxxx>]

** Changed in: ubuntu-power-systems
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1693369

Title:
  5U84 - ses driver isn't binding right - cannot blink lights on 1 of
  the 2 5u84

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  Fix Released
Status in linux source package in Artful:
  Fix Released

Bug description:
  
  == SRU Justification ==
  This bug is resolved by commit 62e62ffd95539b9220894a7900a619e0f3ef4756.

  Without this patch, 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.

  Commit 62e62ffd95 is also needed in Xenial.  However, Xenial also needed some 
  prereq commits, so it's SRU will be sent separately.

  Commit 62e62ffd95 is in mainline as of 4.13-rc1.

  
  == Fix ==
  commit 62e62ffd95539b9220894a7900a619e0f3ef4756
  Author: Maurizio Lombardi <mlombard@xxxxxxxxxx>
  Date:   Tue Jun 27 11:53:27 2017 +0200

      scsi: ses: do not add a device to an enclosure if
  enclosure_add_links() fails.

  == Regression Potential ==
  This patch was also cc'd and applied to upstream stable, so there is 
  upstream confidence in it.

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


  
  This is a request to add the following upstream commit to both Ubuntu 16.04.1 and 16.04.2:

  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/scsi/ses.c?id=9373eba6cfae48911b977d14323032cd5d161aae

  Without this patch, 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.

  You should be able to do:

  ls /sys/block/sdb/device/ | grep enclosure

  and see something like:

  enclosure_device:1

  If you cd to this directory, you can then access the SES controls for
  that slot to flash the LED to assist in locating the disk to replace a
  failed disk.

  Currently with 16.04.1 and 16.04.2, these symlinks are not getting
  created.

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