[PATCH 11/36] drm/amd/display: Add null check to dml21_find_dc_pipes_for_plane

[Hamza Mahfooz]

From: Dillon Varone <dillon.varone at amd.com>

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 at vger.kernel.org
Reviewed-by: Alvin Lee <alvin.lee2 at amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz at amd.com>
Signed-off-by: Dillon Varone <dillon.varone at amd.com>
---
 .../gpu/drm/amd/display/dc/dml2/dml21/dml21_utils.c   | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

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;
-- 
2.45.1