NACK: [SRU][A][PATCH 0/1] Fix for LP#1738334 - hibmc regression

[Kleber Souza]

On 12/15/17 11:41, Daniel Axtens wrote:
> [SRU Justification]
> 
> [Impact]
> On Artful kernels, X fails to start and a kernel splat is printed.
> 
> This is because 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 and X does not start, 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.
> 
> Michal Srb (1):
>   UBUNTU: SAUCE: drm: hibmc: Initialize the hibmc_bo_driver.io_mem_pfn
> 
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c | 1 +
>  1 file changed, 1 insertion(+)
> 

This patchset has been resent.