drm/amd/display: check top_pipe_to_program pointer

From Yang Li
1fffa8ffd62fc511d4447b793641252c4743e81c in linux 5.15.y/5.15.17
a689e8d1f80012f90384ebac9dcfac4201f9f77e in mainline linux

diff --git a/sys/dev/pci/drm/amd/display/dc/core/amdgpu_dc.c b/sys/dev/pci/drm/amd/display/dc/core/amdgpu_dc.c
index c798c65..1860ccc 100644 (file)
--- a/sys/dev/pci/drm/amd/display/dc/core/amdgpu_dc.c
+++ b/sys/dev/pci/drm/amd/display/dc/core/amdgpu_dc.c
@@ -2703,7 +2703,8 @@ static void commit_planes_for_stream(struct dc *dc,
 #endif
 
        if ((update_type != UPDATE_TYPE_FAST) && stream->update_flags.bits.dsc_changed)
-               if (top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
+               if (top_pipe_to_program &&
+                       top_pipe_to_program->stream_res.tg->funcs->lock_doublebuffer_enable) {
                        if (should_use_dmub_lock(stream->link)) {
                                union dmub_hw_lock_flags hw_locks = { 0 };
                                struct dmub_hw_lock_inst_flags inst_flags = { 0 };