From a690c7c710807ea8d228a0e2aedca90ef6b230d6 Mon Sep 17 00:00:00 2001 From: Ahzo Date: Fri, 11 Oct 2019 19:55:03 +0200 Subject: [PATCH] drm/amd/display: add NULL checks for clock manager pointer This fixes kernel NULL pointer dereferences on shutdown: RIP: 0010:build_audio_output.isra.0+0x97/0x110 [amdgpu] RIP: 0010:enable_link_dp+0x186/0x300 [amdgpu] Signed-off-by: Ahzo --- drivers/gpu/drm/amd/display/dc/core/dc_link.c | 2 +- drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index ca20b150afcc..4688d81a37d7 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1492,7 +1492,7 @@ static enum dc_status enable_link_dp( pipe_ctx->stream_res.pix_clk_params.requested_sym_clk = link_settings.link_rate * LINK_RATE_REF_FREQ_IN_KHZ; - if (!apply_seamless_boot_optimization) + if (state->clk_mgr && !apply_seamless_boot_optimization) state->clk_mgr->funcs->update_clocks(state->clk_mgr, state, false); dp_enable_link_phy( diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c index 01a924bf477a..0988451d9628 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c @@ -1169,8 +1169,9 @@ static void build_audio_output( } } - if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT || - pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) { + if (state->clk_mgr && + (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT || + pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)) { audio_output->pll_info.dp_dto_source_clock_in_khz = state->clk_mgr->funcs->get_dp_ref_clk_frequency( state->clk_mgr); -- 2.23.0