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[AceLan Kao <1706833@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Fix Committed => Fix Released

** Changed in: hwe-next
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1706833

Title:
  atheros bt failed after S3

Status in HWE Next:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  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 /build/linux-MD8jsN/linux-4.4.0/drivers/base/firmware_class.c:1148 _request_firmware+0x7c2/0xaf0()

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

  [Fix]
  The fix is from this old thread[1], but the patch didn't be accepted by the maintainer.
  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.

  1. http://lists.openwall.net/netdev/2015/05/06/3

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