drm/msm: always wait for the exclusive fence

Drivers also need to to sync to the exclusive fence when
a shared one is present.

Completely untested since the driver won't even compile on !ARM.
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210702111642.17259-5-christian.koenig@amd.comReviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/msm/msm_gem.c

@@ -817,17 +817,15 @@ int msm_gem_sync_object(struct drm_gem_object *obj,
 	struct dma_fence *fence;
 	int i, ret;
 
-	fobj = dma_resv_shared_list(obj->resv);
-	if (!fobj || (fobj->shared_count == 0)) {
-		fence = dma_resv_excl_fence(obj->resv);
-		/* don't need to wait on our own fences, since ring is fifo */
-		if (fence && (fence->context != fctx->context)) {
-			ret = dma_fence_wait(fence, true);
-			if (ret)
-				return ret;
-		}
+	fence = dma_resv_excl_fence(obj->resv);
+	/* don't need to wait on our own fences, since ring is fifo */
+	if (fence && (fence->context != fctx->context)) {
+		ret = dma_fence_wait(fence, true);
+		if (ret)
+			return ret;
 	}
 
+	fobj = dma_resv_shared_list(obj->resv);
 	if (!exclusive || !fobj)
 		return 0;