drm/amdgpu: add reference for **fence

fix fence is released when pass to **fence sometimes.
add reference for it.

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian K?nig <christian.koenig@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -136,6 +136,7 @@ static void amdgpu_job_work_func(struct work_struct *work)
 		sched_job->free_job(sched_job);
 	mutex_unlock(&sched_job->job_lock);
 	/* after processing job, free memory */
+	fence_put(&sched_job->s_fence->base);
 	kfree(sched_job);
 }
 struct amdgpu_cs_parser *amdgpu_cs_parser_create(struct amdgpu_device *adev,

drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c

@@ -133,13 +133,13 @@ int amdgpu_sched_ib_submit_kernel_helper(struct amdgpu_device *adev,
 			return r;
 		}
 		ibs[num_ibs - 1].sequence = sched_job->s_fence->v_seq;
-		*f = &sched_job->s_fence->base;
+		*f = fence_get(&sched_job->s_fence->base);
 		mutex_unlock(&sched_job->job_lock);
 	} else {
 		r = amdgpu_ib_schedule(adev, num_ibs, ibs, owner);
 		if (r)
 			return r;
-		*f = &ibs[num_ibs - 1].fence->base;
+		*f = fence_get(&ibs[num_ibs - 1].fence->base);
 	}
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c

@@ -877,7 +877,7 @@ static int amdgpu_uvd_send_msg(struct amdgpu_ring *ring,
 	if (fence)
 		*fence = fence_get(f);
 	amdgpu_bo_unref(&bo);
-
+	fence_put(f);
 	if (amdgpu_enable_scheduler)
 		return 0;
 

drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c

@@ -415,6 +415,7 @@ int amdgpu_vce_get_create_msg(struct amdgpu_ring *ring, uint32_t handle,
 		goto err;
 	if (fence)
 		*fence = fence_get(f);
+	fence_put(f);
 	if (amdgpu_enable_scheduler)
 		return 0;
 err:
@@ -481,6 +482,7 @@ int amdgpu_vce_get_destroy_msg(struct amdgpu_ring *ring, uint32_t handle,
 		goto err;
 	if (fence)
 		*fence = fence_get(f);
+	fence_put(f);
 	if (amdgpu_enable_scheduler)
 		return 0;
 err:

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -366,6 +366,7 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
 						 &fence);
 	if (!r)
 		amdgpu_bo_fence(bo, fence, true);
+	fence_put(fence);
 	if (amdgpu_enable_scheduler) {
 		amdgpu_bo_unreserve(bo);
 		return 0;
@@ -495,6 +496,7 @@ int amdgpu_vm_update_page_directory(struct amdgpu_device *adev,
 		if (r)
 			goto error_free;
 		amdgpu_bo_fence(pd, fence, true);
+		fence_put(fence);
 	}
 
 	if (!amdgpu_enable_scheduler || ib->length_dw == 0) {
@@ -812,6 +814,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 		fence_put(*fence);
 		*fence = fence_get(f);
 	}
+	fence_put(f);
 	if (!amdgpu_enable_scheduler) {
 		amdgpu_ib_free(adev, ib);
 		kfree(ib);

drivers/gpu/drm/amd/amdgpu/cik_sdma.c

@@ -669,6 +669,7 @@ static int cik_sdma_ring_test_ib(struct amdgpu_ring *ring)
 	}
 
 err1:
+	fence_put(f);
 	amdgpu_ib_free(adev, &ib);
 err0:
 	amdgpu_wb_free(adev, index);

drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c

@@ -2698,6 +2698,7 @@ static int gfx_v7_0_ring_test_ib(struct amdgpu_ring *ring)
 	}
 
 err2:
+	fence_put(f);
 	amdgpu_ib_free(adev, &ib);
 err1:
 	amdgpu_gfx_scratch_free(adev, scratch);

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -659,6 +659,7 @@ static int gfx_v8_0_ring_test_ib(struct amdgpu_ring *ring)
 		r = -EINVAL;
 	}
 err2:
+	fence_put(f);
 	amdgpu_ib_free(adev, &ib);
 err1:
 	amdgpu_gfx_scratch_free(adev, scratch);

drivers/gpu/drm/amd/amdgpu/sdma_v2_4.c

@@ -733,6 +733,7 @@ static int sdma_v2_4_ring_test_ib(struct amdgpu_ring *ring)
 	}
 
 err1:
+	fence_put(f);
 	amdgpu_ib_free(adev, &ib);
 err0:
 	amdgpu_wb_free(adev, index);

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

@@ -853,6 +853,7 @@ static int sdma_v3_0_ring_test_ib(struct amdgpu_ring *ring)
 		r = -EINVAL;
 	}
 err1:
+	fence_put(f);
 	amdgpu_ib_free(adev, &ib);
 err0:
 	amdgpu_wb_free(adev, index);

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

@@ -313,6 +313,7 @@ int amd_sched_push_job(struct amd_gpu_scheduler *sched,
 		kfree(job);
 		return -EINVAL;
 	}
+	fence_get(&(*fence)->base);
 	job->s_fence = *fence;
 	while (kfifo_in_spinlocked(&c_entity->job_queue, &job, sizeof(void *),
 				   &c_entity->queue_lock) != sizeof(void *)) {