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drm/amd/display: add NULL pointer check

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[Why]
In virtual link use case, link->ddc could be NULL.

[How]
Add null pointer check to avoid undefined behavior.

Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Charlene Liu 2023-01-31 12:51:40 -05:00 committed by Alex Deucher
parent ed6941b632
commit f0584be558
1 changed files with 10 additions and 6 deletions
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16
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
View File

@ -3223,12 +3223,16 @@ static void dcn10_config_stereo_parameters(
timing_3d_format == TIMING_3D_FORMAT_INBAND_FA ||
timing_3d_format == TIMING_3D_FORMAT_DP_HDMI_INBAND_FA ||
timing_3d_format == TIMING_3D_FORMAT_SIDEBAND_FA) {
enum display_dongle_type dongle = \
stream->link->ddc->dongle_type;
if (dongle == DISPLAY_DONGLE_DP_VGA_CONVERTER ||
dongle == DISPLAY_DONGLE_DP_DVI_CONVERTER ||
dongle == DISPLAY_DONGLE_DP_HDMI_CONVERTER)
flags->DISABLE_STEREO_DP_SYNC = 1;
if (stream->link && stream->link->ddc) {
enum display_dongle_type dongle = \
stream->link->ddc->dongle_type;
if (dongle == DISPLAY_DONGLE_DP_VGA_CONVERTER ||
dongle == DISPLAY_DONGLE_DP_DVI_CONVERTER ||
dongle == DISPLAY_DONGLE_DP_HDMI_CONVERTER)
flags->DISABLE_STEREO_DP_SYNC = 1;
}
}
flags->RIGHT_EYE_POLARITY =\
stream->timing.flags.RIGHT_EYE_3D_POLARITY;