[git pull] drm udl fixes

[Dave Airlie]

>
> I've seen that you dropped this patch:
> https://patchwork.kernel.org/patch/10445393/
>
> Is that patch correct or incorrect? In case it is incorrect, do you have
> an idea how should fbdefio be used properly on KMS drivers?

I suppose I was wondering what use fbdefio really has, modern code
should be using KMS interface and the KMS dirty handling should be
able to cover those cases.

I don't really like the maintainability decrease moving to in-driver
page handling causes vs using shmem.

Dave.