From: Taimur Hassan <syed.hassan@xxxxxxx>
commit 5a25cefc0920088bb9afafeb80ad3dcd84fe278b upstream.
[Why & How]
If there is no TG allocation we can dereference a NULL pointer when
checking if the TG is enabled.
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Acked-by: Alan Liu <haoping.liu@xxxxxxx>
Signed-off-by: Taimur Hassan <syed.hassan@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -3293,7 +3293,8 @@ void dcn10_wait_for_mpcc_disconnect(
if (pipe_ctx->stream_res.opp->mpcc_disconnect_pending[mpcc_inst]) {
struct hubp *hubp = get_hubp_by_inst(res_pool, mpcc_inst);
- if (pipe_ctx->stream_res.tg->funcs->is_tg_enabled(pipe_ctx->stream_res.tg))
+ if (pipe_ctx->stream_res.tg &&
+ pipe_ctx->stream_res.tg->funcs->is_tg_enabled(pipe_ctx->stream_res.tg))
res_pool->mpc->funcs->wait_for_idle(res_pool->mpc, mpcc_inst);
pipe_ctx->stream_res.opp->mpcc_disconnect_pending[mpcc_inst] = false;
hubp->funcs->set_blank(hubp, true);
