Since we have removed the case where amdgpu was initializing entitites
with either no schedulers on the list, or with a single NULL scheduler,
and there appears no other drivers which rely on this, we can simplify the
scheduler by explictly rejecting that early.

Signed-off-by: Tvrtko Ursulin <[email protected]>
Cc: Christian König <[email protected]>
Cc: Danilo Krummrich <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Philipp Stanner <[email protected]>
---
 drivers/gpu/drm/scheduler/sched_entity.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_entity.c 
b/drivers/gpu/drm/scheduler/sched_entity.c
index fe174a4857be..bb7e5fc47f99 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -61,32 +61,27 @@ int drm_sched_entity_init(struct drm_sched_entity *entity,
                          unsigned int num_sched_list,
                          atomic_t *guilty)
 {
-       if (!(entity && sched_list && (num_sched_list == 0 || sched_list[0])))
+       if (!entity || !sched_list || !num_sched_list || !sched_list[0])
                return -EINVAL;
 
        memset(entity, 0, sizeof(struct drm_sched_entity));
        INIT_LIST_HEAD(&entity->list);
        entity->rq = NULL;
        entity->guilty = guilty;
-       entity->num_sched_list = num_sched_list;
        entity->priority = priority;
        entity->last_user = current->group_leader;
-       /*
-        * It's perfectly valid to initialize an entity without having a valid
-        * scheduler attached. It's just not valid to use the scheduler before 
it
-        * is initialized itself.
-        */
+       entity->num_sched_list = num_sched_list;
        entity->sched_list = num_sched_list > 1 ? sched_list : NULL;
        RCU_INIT_POINTER(entity->last_scheduled, NULL);
        RB_CLEAR_NODE(&entity->rb_tree_node);
 
-       if (num_sched_list && !sched_list[0]->sched_rq) {
+       if (!sched_list[0]->sched_rq) {
                /* Since every entry covered by num_sched_list
                 * should be non-NULL and therefore we warn drivers
                 * not to do this and to fix their DRM calling order.
                 */
                pr_warn("%s: called with uninitialized scheduler\n", __func__);
-       } else if (num_sched_list) {
+       } else {
                /* The "priority" of an entity cannot exceed the number of 
run-queues of a
                 * scheduler. Protect against num_rqs being 0, by converting to 
signed. Choose
                 * the lowest priority available.
-- 
2.52.0

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