drm/amd/display: Avoid MPC infinite loop

[Why]
In some cases MPC tree bottom pipe ends up point to itself.  This causes
iterating from top to bottom to hang the system in an infinite loop.

[How]
When looping to next MPC bottom pipe, check that the pointer is not same
as current to avoid infinite loop.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Josip Pavic <Josip.Pavic@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 7699743..8e93840 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;

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c
index 3d307dd..116f67a 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c
@@ -531,6 +531,12 @@ static struct mpcc *mpc2_get_mpcc_for_dpp(struct mpc_tree *tree, int dpp_id)
        while (tmp_mpcc != NULL) {
                if (tmp_mpcc->dpp_id == 0xf || 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;