Commit 34276bb0 authored Aug 15, 2016 by Lucas Stach Committed by Rob Herring Aug 15, 2016

of: fix reference counting in of_graph_get_endpoint_by_regs



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: 8ccd0d0c
(of: add helper for getting endpoint node of specific identifiers)
Cc: stable@vger.kernel.org
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>

parent fc520f8b

drivers/of/base.c

+2 −9

Original line number	Diff line number	Diff line
		@@ -2342,20 +2342,13 @@ 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;