[PATCH AUTOSEL 5.10 36/85] coresight: Do not scan for graph if none is present

[Sasha Levin]

From: Suzuki K Poulose <suzuki.poulose at arm.com>

[ Upstream commit 2b921b671a8d29c2adb255a86409aad1e3267309 ]

If a graph node is not found for a given node, of_get_next_endpoint()
will emit the following error message :

 OF: graph: no port node found in /<node_name>

If the given component doesn't have any explicit connections (e.g,
ETE) we could simply ignore the graph parsing. As for any legacy
component where this is mandatory, the device will not be usable
as before this patch. Updating the DT bindings to Yaml and enabling
the schema checks can detect such issues with the DT.

Cc: Mike Leach <mike.leach at linaro.org>
Cc: Leo Yan <leo.yan at linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
Link: https://lore.kernel.org/r/20210405164307.1720226-11-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier at linaro.org>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/hwtracing/coresight/coresight-platform.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 3629b7885aca..c594f45319fc 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -90,6 +90,12 @@ static void of_coresight_get_ports_legacy(const struct device_node *node,
 	struct of_endpoint endpoint;
 	int in = 0, out = 0;
 
+	/*
+	 * Avoid warnings in of_graph_get_next_endpoint()
+	 * if the device doesn't have any graph connections
+	 */
+	if (!of_graph_is_present(node))
+		return;
 	do {
 		ep = of_graph_get_next_endpoint(node, ep);
 		if (!ep)
-- 
2.30.2