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From a5c4f7383c296cbd8b46b997b5f10fcaa0d93f1c Mon Sep 17 00:00:00 2001
From: Ahzo <Ahzo@tutanota.com>
Date: Fri, 11 Oct 2019 19:55:03 +0200
Subject: [PATCH 4203/4736] 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]
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Ahzo <Ahzo@tutanota.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
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 5474e2525e0c..5ce5db7818e4 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1528,7 +1528,7 @@ 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 27542c22fa55..d1e14393a0f0 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
@@ -1158,8 +1158,9 @@ 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);
--
2.17.1
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