drm/xe: Use dma_fence_chain_free in chain fence unused as a sync

A chain fence is uninitialized if not installed in a drm sync obj. Thus
if xe_sync_entry_cleanup is called and sync->chain_fence is non-NULL the
proper cleanup is dma_fence_chain_free rather than a dma-fence put.

Reported-by: Paulo Zanoni <[email protected]>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2411
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2261
Fixes: dd08ebf ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 7f7a2da)
Signed-off-by: Rodrigo Vivi <[email protected]>

Author: mbrost05

drivers/gpu/drm/xe/xe_sync.c

@@ -263,7 +263,7 @@ void xe_sync_entry_cleanup(struct xe_sync_entry *sync)
 	if (sync->fence)
 		dma_fence_put(sync->fence);
 	if (sync->chain_fence)
-		dma_fence_put(&sync->chain_fence->base);
+		dma_fence_chain_free(sync->chain_fence);
 	if (sync->ufence)
 		user_fence_put(sync->ufence);
 }