On Wed, Dec 11, 2024 at 06:15:44PM +0800, jianqi.ren.cn@windriver.com wrote:
From: Wayne Lin wayne.lin@amd.com
[ Upstream commit fcf6a49d79923a234844b8efe830a61f3f0584e4 ]
[Why] When unplug one of monitors connected after mst hub, encounter null pointer dereference.
It's due to dc_sink get released immediately in early_unregister() or detect_ctx(). When commit new state which directly referring to info stored in dc_sink will cause null pointer dereference.
[how] Remove redundant checking condition. Relevant condition should already be covered by checking if dsc_aux is null or not. Also reset dsc_aux to NULL when the connector is disconnected.
Reviewed-by: Jerry Zuo jerry.zuo@amd.com Acked-by: Zaeem Mohamed zaeem.mohamed@amd.com Signed-off-by: Wayne Lin wayne.lin@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Jianqi Ren jianqi.ren.cn@windriver.com
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 4 ++++ 1 file changed, 4 insertions(+)
You sent this 3 times, all different, so I have no idea what to do.
Ok, I give up. I'm deleting ALL of your pending stable patches from my review queue now due to all of the problems that these have had.
Please work with a more experienced kernel developer at your company to get these backports correct, and complete, and send them as a patch series with the correct information and documentation as to what is going on, so that we have a chance to get this right.
thanks,
greg k-h