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drm/amd/display: Fix NULL pointer dereference

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[Why]
On a mst branch with multi display setup, dc context is obselete
after updating the first stream. Referencing the same dc context
for the next stream update to fetch dc pointer leads to NULL
pointer dereference.

[How]
Get the dc pointer from the link rather than context.

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit dc69b48988)
Cc: stable@vger.kernel.org
This commit is contained in:
Meenakshikumar Somasundaram 2025-09-29 14:28:34 -04:00 committed by Alex Deucher
parent 211ddde082
commit 89939cf252
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/link/accessories/link_dp_cts.c
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@ -78,6 +78,7 @@ static void dp_retrain_link_dp_test(struct dc_link *link,
struct audio_output audio_output[MAX_PIPES];
struct dc_stream_state *streams_on_link[MAX_PIPES];
int num_streams_on_link = 0;
struct dc *dc = (struct dc *)link->dc;
needs_divider_update = (link->dc->link_srv->dp_get_encoding_format(link_setting) !=
link->dc->link_srv->dp_get_encoding_format((const struct dc_link_settings *) &link->cur_link_settings));
@ -150,7 +151,7 @@ static void dp_retrain_link_dp_test(struct dc_link *link,
if (streams_on_link[i] && streams_on_link[i]->link && streams_on_link[i]->link == link) {
stream_update.stream = streams_on_link[i];
stream_update.dpms_off = &dpms_off;
dc_update_planes_and_stream(state->clk_mgr->ctx->dc, NULL, 0, streams_on_link[i], &stream_update);
dc_update_planes_and_stream(dc, NULL, 0, streams_on_link[i], &stream_update);
}
}
}