Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: High
     Assignee: dann frazier (dannf)
         Status: In Progress

** Affects: linux (Ubuntu Artful)
     Importance: High
     Assignee: dann frazier (dannf)
         Status: In Progress

** Affects: linux (Ubuntu Bionic)
     Importance: High
     Assignee: dann frazier (dannf)
         Status: In Progress

** Also affects: linux (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
     Assignee: dann frazier (dannf)
       Status: In Progress

** Changed in: linux (Ubuntu Artful)
       Status: New => In Progress

** Changed in: linux (Ubuntu Artful)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: linux (Ubuntu Artful)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Bionic)
   Importance: Undecided => High

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

Title:
  hisi_sas: driver robustness fixes

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