From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: Mon, 10 Jul 2023 06:24:59 +0000 (+0530)
Subject: coresight: platform: acpi: Ignore the absence of graph
X-Git-Tag: v6.6.17~4035^2~28^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3a2888aa1f962c55ca36119aebe67355c7bf54e4;p=platform%2Fkernel%2Flinux-rpi.git

coresight: platform: acpi: Ignore the absence of graph

Some components may not have graph connections for describing
the trace path. e.g., ETE, where it could directly use the per
CPU TRBE. Ignore the absence of graph connections

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20230710062500.45147-6-anshuman.khandual@arm.com
---

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 27ca22c..7d7b641 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -667,8 +667,12 @@ static int acpi_coresight_parse_graph(struct device *dev,
 	struct coresight_connection *new_conn;
 
 	graph = acpi_get_coresight_graph(adev);
+	/*
+	 * There are no graph connections, which is fine for some components.
+	 * e.g., ETE
+	 */
 	if (!graph)
-		return -ENOENT;
+		return 0;
 
 	nlinks = graph->package.elements[2].integer.value;
 	if (!nlinks)