artful verification - I've completed the iozone test on a filesystem
atop a disk connected to a hisi sas controller w/o error.

** Description changed:

  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 &
+ $ iozone -a &
  $ 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.

** Tags removed: verification-needed-artful
** Tags added: verification-done-artful

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  hisi_sas: driver robustness fixes

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