drm/amdgpu: remove scheduler fence list v2

Unused and missing proper locking.

v2: add locking comment to commit message.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com> (v1)

drivers/gpu/drm/amd/scheduler/gpu_scheduler.c

@@ -195,7 +195,6 @@ int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
 	entity->fence_context = fence_context_alloc(1);
 	snprintf(name, sizeof(name), "c_entity[%llu]", entity->fence_context);
 	memcpy(entity->name, name, 20);
-	INIT_LIST_HEAD(&entity->fence_list);
 	if(kfifo_alloc(&entity->job_queue,
 		       jobs * sizeof(void *),
 		       GFP_KERNEL))

drivers/gpu/drm/amd/scheduler/gpu_scheduler.h

@@ -53,7 +53,6 @@ struct amd_sched_entity {
 	wait_queue_head_t		wait_emit;
 	bool                            is_pending;
 	uint64_t                        fence_context;
-	struct list_head		fence_list;
 	char                            name[20];
 };
 
@@ -78,7 +77,6 @@ struct amd_run_queue {
 struct amd_sched_fence {
 	struct fence                    base;
 	struct fence_cb                 cb;
-	struct list_head		list;
 	struct amd_sched_entity	        *entity;
 	uint64_t			v_seq;
 	spinlock_t			lock;

drivers/gpu/drm/amd/scheduler/sched_fence.c

@@ -27,16 +27,7 @@
 #include <drm/drmP.h>
 #include "gpu_scheduler.h"
 
-static void amd_sched_fence_wait_cb(struct fence *f, struct fence_cb *cb)
-{
-	struct amd_sched_fence *fence =
-		container_of(cb, struct amd_sched_fence, cb);
-	list_del_init(&fence->list);
-	fence_put(&fence->base);
-}
-
-struct amd_sched_fence *amd_sched_fence_create(
-	struct amd_sched_entity *s_entity)
+struct amd_sched_fence *amd_sched_fence_create(struct amd_sched_entity *s_entity)
 {
 	struct amd_sched_fence *fence = NULL;
 	fence = kzalloc(sizeof(struct amd_sched_fence), GFP_KERNEL);
@@ -49,14 +40,6 @@ struct amd_sched_fence *amd_sched_fence_create(
 		&fence->lock,
 		s_entity->fence_context,
 		fence->v_seq);
-	fence_get(&fence->base);
-	list_add_tail(&fence->list, &s_entity->fence_list);
-	if (fence_add_callback(&fence->base,&fence->cb,
-			       amd_sched_fence_wait_cb)) {
-		fence_put(&fence->base);
-		kfree(fence);
-		return NULL;
-	}
 	return fence;
 }