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drm/amd/display: check TG is non-null before checking if enabled

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[ Upstream commit 5a25cefc09 ]

[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@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alan Liu <haoping.liu@amd.com>
Signed-off-by: Taimur Hassan <syed.hassan@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Taimur Hassan 2023-06-20 17:00:28 -04:00 • committed by Justin Hammond
parent 29bb6b5325
commit 0c78120bd5
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
View file

@ -3142,7 +3142,8 @@ 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);