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drm/amd/display: fix a dereference of a NULL pointer

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[why&how]
In some platform out_transfer_func may not be popualted. We need to check
for null before dereferencing it.

Fixes: d2dea1f140 ("drm/amd/display: Generalize new minimal transition path")
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Wenjing Liu <wenjing.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:
Wenjing Liu 2024-03-12 15:31:59 -04:00 committed by Alex Deucher
parent 25358e04a4
commit fe869c2e53
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -3024,7 +3024,8 @@ static void backup_planes_and_stream_state(
scratch->blend_tf[i] = *status->plane_states[i]->blend_tf;
}
scratch->stream_state = *stream;
scratch->out_transfer_func = *stream->out_transfer_func;
if (stream->out_transfer_func)
scratch->out_transfer_func = *stream->out_transfer_func;
}
static void restore_planes_and_stream_state(
@ -3046,7 +3047,8 @@ static void restore_planes_and_stream_state(
*status->plane_states[i]->blend_tf = scratch->blend_tf[i];
}
*stream = scratch->stream_state;
*stream->out_transfer_func = scratch->out_transfer_func;
if (stream->out_transfer_func)
*stream->out_transfer_func = scratch->out_transfer_func;
}
static bool update_planes_and_stream_state(struct dc *dc,