[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: Josip Pavic <Josip.Pavic@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
/* find bottommost mpcc. */
while (bottommost_mpcc->mpcc_bot) {
+ /* avoid circular linked link */
+ ASSERT(bottommost_mpcc != bottommost_mpcc->mpcc_bot);
+ if (bottommost_mpcc == bottommost_mpcc->mpcc_bot)
+ break;
+
bottommost_mpcc = bottommost_mpcc->mpcc_bot;
}