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** Tags added: verification-needed-artful

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  hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add
  io_mem_pfn callback")

Status in linux package in Ubuntu:
Status in linux source package in Artful:
  Fix Committed

Bug description:
  [SRU Justification]

  On Artful kernels, X fails to start and a kernel splat is printed.

  This is cbecause ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is
  incomplete: the hisilicon hibmc driver does not contain the callback
  and so the kernel tries to execute code at NULL.

  There is a discussion and potential fix at The 
fix hasn't landed yet and it looks like they're going to re-engineer the entire 
section instead.

  Rather than wait for that and deal with the massive regression
  potential, the fix I have picked to submit is very very minimal and
  touches only hibmc.

  [Regression Potential]
  Minimal - fix only touches hibmc driver. Tested on D05 board.

  Install patched kernel, try to start X. If it succeeds, the fix works. If 
there's a kernel splat, the fix does not work.

  HiSilicon would really like this fix in Artful in such time so that when the 
next 16.04 point release ships in February, the HWE kernel will work with Xorg.

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