of: fix reference counting in of_graph_get_endpoint_by_regs

commit 34276bb062b8449b3b0a208c9b848a1a27920075 upstream.

The called of_graph_get_next_endpoint() already decrements the refcount
of the prev node, so it is wrong to do it again in the calling function.

Use the for_each_endpoint_of_node() helper to interate through the
endpoint OF nodes, which already does the right thing and simplifies
the code a bit.

Fixes: 8ccd0d0ca041
(of: add helper for getting endpoint node of specific identifiers)
Reported-by: David Jander <david@protonic.nl>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 942461f..3134129 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2253,20 +2253,13 @@ struct device_node *of_graph_get_endpoint_by_regs(
        const struct device_node *parent, int port_reg, int reg)
 {
        struct of_endpoint endpoint;
-       struct device_node *node, *prev_node = NULL;
-
-       while (1) {
-               node = of_graph_get_next_endpoint(parent, prev_node);
-               of_node_put(prev_node);
-               if (!node)
-                       break;
+       struct device_node *node = NULL;
 
+       for_each_endpoint_of_node(parent, node) {
                of_graph_parse_endpoint(node, &endpoint);
                if (((port_reg == -1) || (endpoint.port == port_reg)) &&
                        ((reg == -1) || (endpoint.id == reg)))
                        return node;
-
-               prev_node = node;
        }
 
        return NULL;