** Also affects: linux
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1738334
Title:
hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add
io_mem_pfn callback")
Status in Linux:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Artful:
Fix Released
Bug description:
[SRU Justification]
[Impact]
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.
[Fix]
There is a discussion and potential fix at
https://lists.freedesktop.org/archives/dri-devel/2017-November/159002.html 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.
[Testcase]
Install patched kernel, try to start X. If it succeeds, the fix works. If
there's a kernel splat, the fix does not work.
[Notes]
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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