** Description changed:

  [Impact]
  There are several bugs in the driver that can cause it to fail during 
teardown/error recovery.
  
  [Test Case]
- Regression tested by isuing sg_reset (--bus|--device|--host) commands during 
an iozone3 run on a disk attached to a hisi_sas controller.
+ 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 /dev/sda; sleep 5; done
+ 
  
  [Regression Risk]
- All fixes are encapsulated within a single driver which was explicitly tested.
+ All fixes are encapsulated within a single driver which was explicitly tested 
for regressions.

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https://bugs.launchpad.net/bugs/1739807

Title:
  hisi_sas: driver robustness fixes

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  [Impact]
  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 /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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