FAILED: patch "[PATCH] drm/amd/display: Add null check to" failed to apply to 5.10-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.10-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 <stable@vger.kernel.org>.

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-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x a157dcc521dcb8eb0acb50d66d1b0fc5efcea789
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024081202-lens-amniotic-72e8@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

a157dcc521dc ("drm/amd/display: Add null check to dml21_find_dc_pipes_for_plane")
70839da63605 ("drm/amd/display: Add new DCN401 sources")

thanks,

greg k-h

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

From a157dcc521dcb8eb0acb50d66d1b0fc5efcea789 Mon Sep 17 00:00:00 2001
From: Dillon Varone <dillon.varone@amd.com>
Date: Tue, 4 Jun 2024 15:34:36 -0400
Subject: [PATCH] drm/amd/display: Add null check to
 dml21_find_dc_pipes_for_plane

When a phantom stream is in the process of being deconstructed, there
could be pipes with no associated planes.  In that case, ignore the
phantom stream entirely when searching for associated pipes.

Cc: stable@vger.kernel.org
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_utils.c b/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_utils.c
index 4e12810308a4..4166332b5b89 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_utils.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/dml21_utils.c
@@ -126,10 +126,15 @@ int dml21_find_dc_pipes_for_plane(const struct dc *in_dc,
 	if (dc_phantom_stream && num_pipes > 0) {
 		dc_phantom_stream_status = dml_ctx->config.callbacks.get_stream_status(context, dc_phantom_stream);
 
-		/* phantom plane will have same index as main */
-		dc_phantom_plane = dc_phantom_stream_status->plane_states[dc_plane_index];
+		if (dc_phantom_stream_status) {
+			/* phantom plane will have same index as main */
+			dc_phantom_plane = dc_phantom_stream_status->plane_states[dc_plane_index];
 
-		dml_ctx->config.callbacks.get_dpp_pipes_for_plane(dc_phantom_plane, &context->res_ctx, dc_phantom_pipes);
+			if (dc_phantom_plane) {
+				/* only care about phantom pipes if they contain the phantom plane */
+				dml_ctx->config.callbacks.get_dpp_pipes_for_plane(dc_phantom_plane, &context->res_ctx, dc_phantom_pipes);
+			}
+		}
 	}
 
 	return num_pipes;