Public bug reported:
== Comment: #0 - Hendrik Brueckner <[email protected]> - 2016-08-03 09:04:43
==
Please backport:
commit 0f5d050ceaa31b2229102211d60c149f920df3aa
Author: Sebastian Ott <[email protected]>
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: [email protected] #v4.4+
Signed-off-by: Sebastian Ott <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Reviewed-by: Peter Oberparleiter <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-144469 severity-high
targetmilestone-inin1604
** Tags added: architecture-s39064 bugnameltc-144469 severity-high
targetmilestone-inin1604
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1609415
Title:
s390/cio: fix reset of channel measurement block
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