[PATCH] drm/amdgpu: fix check in fbdev init

[Greg KH]

On Wed, Aug 10, 2022 at 11:28:18AM -0400, Alex Deucher wrote:
> On Tue, Jul 19, 2022 at 2:57 PM Alex Deucher <alexander.deucher at amd.com> wrote:
> >
> > The new vkms virtual display code is atomic so there is
> > no need to call drm_helper_disable_unused_functions()
> > when it is enabled.  Doing so can result in a segfault.
> > When the driver switched from the old virtual display code
> > to the new atomic virtual display code, it was missed that
> > we enable virtual display unconditionally under SR-IOV
> > so the checks here missed that case.  Add the missing
> > check for SR-IOV.
> >
> > There is no equivalent of this patch for Linus' tree
> > because the relevant code no longer exists.  This patch
> > is only relevant to kernels 5.15 and 5.16.
> >
> > Fixes: 84ec374bd580 ("drm/amdgpu: create amdgpu_vkms (v4)")
> > Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> > Cc: stable at vger.kernel.org # 5.15.x
> > Cc: hgoffin at amazon.com
> 
> Hi Greg,
> 
> Is there any chance this can get applied?  It fixes a regression on
> 5.15 and 5.16.

Ah, missed this as it was not obvious that this was a not-upstream
commit at all, sorry.

I'll dig it out of lore.kernel.org and queue it up for the next round of
releases, but note, this is our "busy time" with many patches marked for
stable.

Oh and 5.16 is long end-of-life, nothing anyone can do there, and no one
should be using that kernel version anymore, so no issues there.

thanks,

greg k-h