This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag 'verification-needed-artful' to 'verification-failed-

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

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** Tags added: verification-needed-artful

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  hisi_sas: driver robustness fixes

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  There are several bugs in the driver that can cause it to fail during 
teardown/error recovery.

  [Test Case]
  Regression tested by issuing sg_reset commands in a loop during an iozone3 
run on a disk attached to a hisi_sas controller.

  $ iozone -i &
  $ while :; do sudo sg_reset --device /dev/sda; sleep 5; done

  [Regression Risk]
  All fixes are encapsulated within a single driver which was explicitly tested 
for regressions.

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