drm/amdgpu: use dma_resv_get_singleton in amdgpu_pasid_free_cb

Makes the code a bit more simpler.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Link: https://patchwork.freedesktop.org/patch/msgid/20220321135856.1331-15-christian.koenig@amd.com

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

@@ -107,36 +107,19 @@ static void amdgpu_pasid_free_cb(struct dma_fence *fence,
 void amdgpu_pasid_free_delayed(struct dma_resv *resv,
 			       u32 pasid)
 {
-	struct dma_fence *fence, **fences;
 	struct amdgpu_pasid_cb *cb;
-	unsigned count;
+	struct dma_fence *fence;
 	int r;
 
-	r = dma_resv_get_fences(resv, true, &count, &fences);
+	r = dma_resv_get_singleton(resv, true, &fence);
 	if (r)
 		goto fallback;
 
-	if (count == 0) {
+	if (!fence) {
 		amdgpu_pasid_free(pasid);
 		return;
 	}
 
-	if (count == 1) {
-		fence = fences[0];
-		kfree(fences);
-	} else {
-		uint64_t context = dma_fence_context_alloc(1);
-		struct dma_fence_array *array;
-
-		array = dma_fence_array_create(count, fences, context,
-					       1, false);
-		if (!array) {
-			kfree(fences);
-			goto fallback;
-		}
-		fence = &array->base;
-	}
-
 	cb = kmalloc(sizeof(*cb), GFP_KERNEL);
 	if (!cb) {
 		/* Last resort when we are OOM */