linux-kernel - [RFC 03/11] coresight: Do not scan for graph if none is present

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Message-Id: <1605012309-24812-4-git-send-email-anshuman.khandual@arm.com>
Date:   Tue, 10 Nov 2020 18:15:01 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org
Cc:     linux-kernel@...r.kernel.org, suzuki.poulose@....com,
        mathieu.poirier@...aro.org, mike.leach@...aro.org,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: [RFC 03/11] coresight: Do not scan for graph if none is present

From: Suzuki K Poulose <suzuki.poulose@....com>

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.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 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 3629b78..c594f45 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)
-- 
2.7.4