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[Frank Heimes <1672650@xxxxxxxxxxxxxxxxxx>]

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => bugproxy (bugproxy)

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https://bugs.launchpad.net/bugs/1672650

Title:
  chzdev ccwgroup qeth properties incorrect ordering with respect to
  online

Status in Ubuntu on IBM z Systems:
  New
Status in s390-tools package in Ubuntu:
  New
Status in s390-tools source package in Xenial:
  New
Status in s390-tools source package in Yakkety:
  New

Bug description:
  For Canonical Openstack we are currently preseeding LPARs with
  bridge_role=primary setting.

  This is achieved by setting the property with chzdeve e.g.:

  $ chzdev --no-root-update -pVe c003 bridge_role=primary

  On boot this sometimes results in generated udev rules failing to apply the bridge_role property:
  systemd-udevd[2634]: error opening ATTR{/sys/devices/qeth/0.0.c003/bridge_role} for writing: Permission denied

  The reason being, is that bridge_role attribute is attempted to
  written, before it exists, as the devices have not been onlined yet
  into a ccwgroup.

  Updating zdev/src/qeth.c to use ordering after online and check for online only appears to resolve above race condition, for the property in question
  	.order_cmp = ccw_online_only_order_cmp,
  	.check = ccw_online_only_check,

  However looking at that file, it would appear to me that most qeth
  properties should be ordered after online, as during boot they do not
  exist until after the qeth is onlined.

  Please reverse proxy this bug report to IBM s390-tools engineering.

  Regards,

  Dimitri.

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