drm/amdgpu: amdgpu_ctx_add_fence can't fail

No more waiting for a fence done here.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1217,15 +1217,7 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
 	job->owner = p->filp;
 	p->fence = dma_fence_get(&job->base.s_fence->finished);
 
-	r = amdgpu_ctx_add_fence(p->ctx, entity, p->fence, &seq);
-	if (r) {
-		dma_fence_put(p->fence);
-		dma_fence_put(&job->base.s_fence->finished);
-		amdgpu_job_free(job);
-		amdgpu_mn_unlock(p->mn);
-		return r;
-	}
-
+	amdgpu_ctx_add_fence(p->ctx, entity, p->fence, &seq);
 	amdgpu_cs_post_dependencies(p);
 
 	if ((job->preamble_status & AMDGPU_PREAMBLE_IB_PRESENT) &&

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

@@ -434,7 +434,7 @@ int amdgpu_ctx_put(struct amdgpu_ctx *ctx)
 	return 0;
 }
 
-int amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx,
+void amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx,
 			  struct drm_sched_entity *entity,
 			  struct dma_fence *fence, uint64_t* handle)
 {
@@ -458,8 +458,6 @@ int amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx,
 	dma_fence_put(other);
 	if (handle)
 		*handle = seq;
-
-	return 0;
 }
 
 struct dma_fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,

drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.h

@@ -65,7 +65,7 @@ int amdgpu_ctx_put(struct amdgpu_ctx *ctx);
 
 int amdgpu_ctx_get_entity(struct amdgpu_ctx *ctx, u32 hw_ip, u32 instance,
 			  u32 ring, struct drm_sched_entity **entity);
-int amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx,
+void amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx,
 			  struct drm_sched_entity *entity,
 			  struct dma_fence *fence, uint64_t *seq);
 struct dma_fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,