[PATCH] drm/radeon: Fix oops upon driver load on PowerXpress laptops

[Lukas Wunner]

On Tue, May 23, 2017 at 12:09:49PM +0900, Michel Dänzer wrote:
> On 22/05/17 11:04 PM, Lukas Wunner wrote:
> > On Sun, May 21, 2017 at 09:31:09AM +0200, Nicolai Stange wrote:
> >> On Thu, May 18 2017, Lukas Wunner wrote:
> > [snip]
> >>> Reported-by: Nicolai Stange <nicstange at gmail.com>
> >>> Fixes: 7ffb0ce31cf9 ("drm/radeon: Don't register Thunderbolt eGPU with vga_switcheroo")
> >>> Signed-off-by: Lukas Wunner <lukas at wunner.de>
> >>> ---
> >>>
> >>> Awaiting a Tested-by: from Nicolai, but it's clear this is a bug and
> >>> needs to be fixed, so sending out with a proper commit message now.
> >>> The bug was only introduced to radeon, not amdgpu.
> >>
> >> Tested-by: Nicolai Stange <nicstange at gmail.com>
> >>
> >> Thanks for the quick fix!
> >>
> >>> @Alex Deucher: I could push this to drm-misc-fixes but then it wouldn't
> >>> land before -rc3 because Sean Paul has already sent out the -rc2 pull.
> >>> I notice you haven't sent out a pull for -rc2 yet, so maybe you want to
> >>> take it yourself?  Whichever you prefer.  Thanks & sorry for the breakage!
> > 
> > I've learned this morning that Alex is on vacation.
> 
> Christian König is standing in for Alex.

By his own account, he already has "all hands full replacing him [Alex]",
explicitly asked Daniel to merge an amdgpu patch through drm-misc-next for
this reason and lacks permission to update branches in Alex' repo on fdo:

"One lesson learned from the past week is that Alex needs to stop using
his personal repository on fdo.
We were asked a couple of times if I couldn't update a branch there from 
different directions, which we obviously can't do."

https://lists.freedesktop.org/archives/dri-devel/2017-May/142376.html
https://lists.freedesktop.org/archives/dri-devel/2017-May/142380.html


> > I've pushed the patch to drm-misc-fixes so that the issue is fixed in
> > 4.12-rc3.
> 
> I don't think there was any particular need to bypass the normal radeon
> tree for this. There was plenty of time for the fix to get into 4.12
> final, even after Alex is back.

Well, it wouldn't be nice towards users affected by the same issue
who may waste time with bisecting to just sit on a fix twiddling thumbs.

Thanks,

Lukas