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[Frank Heimes <1609415@xxxxxxxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1609415

Title:
  s390/cio: fix reset of channel measurement block

Status in Ubuntu on IBM z Systems:
  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 Yakkety:
  Fix Released

Bug description:
  == Comment: #0 - Hendrik Brueckner <brueckner@xxxxxxxxxx> - 2016-08-03 09:04:43 ==
  Please backport:
  commit 0f5d050ceaa31b2229102211d60c149f920df3aa
  Author: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
  Date:   Tue Jul 12 19:57:57 2016 +0200

      s390/cio: allow to reset channel measurement block
      
      Prior to commit 1bc6664bdfb949bc69a08113801e7d6acbf6bc3f a call to
      enable_cmf for a device for which channel measurement was already
      enabled resulted in a reset of the measurement data.
      
      What looked like bugs at the time (a 2nd allocation was triggered
      but failed, reset was called regardless of previous failures, and
      errors have not been reported to userspace) was actually something
      at least one userspace tool depended on. Restore that behavior in
      a sane way.
      
      Fixes: 1bc6664bdfb ("s390/cio: use device_lock during cmb activation")
      Cc: stable@xxxxxxxxxxxxxxx #v4.4+
      Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
      Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
      Reviewed-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxxxxxxx>
      Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

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