FAILED: patch "[PATCH] drm/amd/display: Fix NULL pointer dereference" failed to apply to 6.17-stable tree

The patch below does not apply to the 6.17-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.17.y
git checkout FETCH_HEAD
git cherry-pick -x 89939cf252d80237ed380c1d20575ecfe56ff894
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025102625-bright-circulate-8844@gregkh' --subject-prefix 'PATCH 6.17.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 89939cf252d80237ed380c1d20575ecfe56ff894 Mon Sep 17 00:00:00 2001
From: Meenakshikumar Somasundaram <[email protected]>
Date: Mon, 29 Sep 2025 14:28:34 -0400
Subject: [PATCH] drm/amd/display: Fix NULL pointer dereference

[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.

index 9e33bf937a69..2676ae9f6fe8 100644
@@ -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);
 		}
 	}
 }