[Nouveau] Backport request for commit 579b7c582 (drm/nouveau/pmu: do not assume a PMU is present)

[Greg KH]

On Wed, Jan 06, 2016 at 09:23:20AM -0500, Ilia Mirkin wrote:
> This commit should be backported to kernel 4.3 (apologies for
> line-wrapping). Without it, we get a null deref (i.e. oops) on GF117
> GPUs which for one reason or another don't have the PMU hooked up.
> That should be fixed in its own right, but that's a separate matter.
> The issue was introduced in commit e2ca4e7d6e (drm/nouveau/pmu:
> convert to new-style nvkm_subdev)
> 
> commit 579b7c58215329803ce184704463de09f0f310ac
> Author: Alexandre Courbot <acourbot at nvidia.com>
> Date:   Thu Sep 3 17:39:52 2015 +0900
> 
>     drm/nouveau/pmu: do not assume a PMU is present
> 
>     Some devices may not have a PMU. Avoid a NULL pointer dereference in
>     such cases by checking whether the pointer given to nvkm_pmu_pgob() is
>     valid.
> 
>     Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
>     Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
> 

Now applied, thanks.

greg k-h