AMDGPU spams log (regression in 5.15.128)

[pmenzel]

Regression introduced in commit 4921792e04 (drm/amdgpu: install stub fence into potential unused fence pointers) in Linux 5.15.128:

commit 4921792e04f2125b5eadef9dbe9417a8354c7eff
Author: Lang Yu <Lang.Yu@amd.com>
Date:   Fri May 5 20:14:15 2023 +0800

    drm/amdgpu: install stub fence into potential unused fence pointers
    
    [ Upstream commit 187916e6ed9d0c3b3abc27429f7a5f8c936bd1f0 ]
    
    When using cpu to update page tables, vm update fences are unused.
    Install stub fence into these fence pointers instead of NULL
    to avoid NULL dereference when calling dma_fence_wait() on them.
    
    Suggested-by: Christian König <christian.koenig@amd.com>
    Signed-off-by: Lang Yu <Lang.Yu@amd.com>
    Reviewed-by: Christian König <christian.koenig@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>

 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Alex Deucher comments:

This was autoselected for stable, but was not applicable and should be reverted. I've asked Greg and Sasha to revert it.

Originally posted by @pmenzel in #2976 (comment)

[pmenzel]

6.1.52.mx64.456 and 6.5.2.mx64.452 are not affected by this.