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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

The requested commit is in Bionic as of Ubuntu-4.15.0-23.25~80:
25dbc82 s390/qdio: don't retry EQBS after CCQ 96

The requested commit is in Xenial as of Ubuntu-4.4.0-128.154~221:
e26f413 s390/qdio: don't retry EQBS after CCQ 96


** Changed in: linux (Ubuntu Xenial)
       Status: In Progress => Fix Released

** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1781535

Title:
  qdio: don't retry EQBS after CCQ 96

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  Description:  qdio: don't retry EQBS after CCQ 96

  Symptom:      Queue stalls, over-/underreporting of buffer errors.

  Problem:      Immediate retry of EQBS after CCQ 96 means that we
                potentially misreport the state of buffers inspected
                during the first EQBS call.

  Solution:     On CCQ 96, first process the discovered state.
                Afterwards, higher-level code will eventually trigger an
                EQBS/inspection of the remaining buffers. Their state is
                now processed independently from the state that was
                discovered during the first EQBS.

  Upstream-ID:  dae55b6fef58530c13df074bcc182c096609339e

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