Merge tag 'amd-drm-fixes-6.0-2022-08-17' of https://gitlab.freedesktop.org/agd5f...

[sfrench/cifs-2.6.git] / drivers / gpu / drm / amd / display / dc / dcn10 / dcn10_mpc.c

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c
index 769974375b4b350f33ca19649aa89eb2161ba3a8..8e9384094f6d6b3d8482983baa3440c7d119d49f 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c
@@ -131,6 +131,12 @@ struct mpcc *mpc1_get_mpcc_for_dpp(struct mpc_tree *tree, int dpp_id)
        while (tmp_mpcc != NULL) {
                if (tmp_mpcc->dpp_id == dpp_id)
                        return tmp_mpcc;
+
+               /* avoid circular linked list */
+               ASSERT(tmp_mpcc != tmp_mpcc->mpcc_bot);
+               if (tmp_mpcc == tmp_mpcc->mpcc_bot)
+                       break;
+
                tmp_mpcc = tmp_mpcc->mpcc_bot;
        }
        return NULL;