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  atheros bt failed after S3

Status in HWE Next:
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:

Bug description:
  BT fails to load firmware after S3. On my system it's atheros' chip, but the 
same issue can be seen with broadcom's chip, too.
     [542.6274] WARNING: CPU: 0 PID: 20729 at 

  The root cause of this issue is request_firmware() is being called at
  the wrong time.

  The fix is from this old thread[1], but the patch didn't be accepted by the 
  It prevents the work queue from being re-created and calls request_firmware() 
immediately before usermodehelper is fully resumed. Making the workqueue 
freezable preserves the delay and will postpone the firmware loading time.

  [Test Case]
  Verified on the machine has this issue, and confirm this patch works.

  [Regression Potential]
  From what I can see, I think this change should be safe, and after 240 times 
S3 test, the system and BT functions are still working.


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