of: Fix refcount leakage for OF node returned by __of_get_dma_parent()

commit 5d009e024056ded20c5bb1583146b833b23bbd5a upstream.

__of_get_dma_parent() returns OF device node @args.np, but the node's
refcount is increased twice, by both of_parse_phandle_with_args() and
of_node_get(), so causes refcount leakage for the node.

Fix by directly returning the node got by of_parse_phandle_with_args().

Fixes: f83a6e5 ("of: address: Add support for the parent DMA bus")
Cc: [email protected]
Signed-off-by: Zijun Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: zijun-hu

drivers/of/address.c

@@ -595,7 +595,7 @@ struct device_node *__of_get_dma_parent(const struct device_node *np)
 	if (ret < 0)
 		return of_get_parent(np);
 
-	return of_node_get(args.np);
+	return args.np;
 }
 #endif