Hmm, I was under the impression from an email I got that this was 
already reverted from 3.16. Clearly, communication is hard.

Let me re-iterate, to be sure: kernels 3.17 and older

1. need to revert the backport of upstream commit 
f6ff4f67cdf8455d0a4226eeeaf5af17c37d05eb (I think most have done that 
already) and

2. should apply the corrected backport which I am attaching yet again 
(seems like when I sent this patch around two weeks ago, it wasn't 
picked up).

Thanks,
Nicolai

On 07.04.2016 04:15, Taras Prokopenko wrote:
>
> ---------- Forwarded message ----------
> From: *Taras Prokopenko* <taras.prokopenko@gmail.com
> <mailto:taras.prokopenko@gmail.com>>
> Date: 2016-04-07 12:04 GMT+03:00
> Subject: Please revert wrong kernel OOPS patch in -69 !
> To: luis.henriques@canonical.com <mailto:luis.henriques@canonical.com>
> Cc: jslaby@suse.cz <mailto:jslaby@suse.cz>
>
>
> Please test your changes! Lost 1/2 a day to figure out whats causing my
> pc to hang.
>
> OopsText:
>   BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
>   IP: [<ffffffffc03b83ed>] radeon_fence_ref+0xd/0x50 [radeon]
>   PGD 0
>   Oops: 0002 [#1] SMP
>
>
> https://lists.ubuntu.com/archives/kernel-team/2016-February/072148.html
>
> Damn
>