[PATCH 6.5 560/739] coresight: platform: acpi: Ignore the absence of graph

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6.5-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit 3a2888aa1f962c55ca36119aebe67355c7bf54e4 ]

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@xxxxxxx>
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Link: https://lore.kernel.org/r/20230710062500.45147-6-anshuman.khandual@xxxxxxx
Stable-dep-of: 1a9e02673e25 ("coresight: Fix memory leak in acpi_buffer->pointer")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/hwtracing/coresight/coresight-platform.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 3e2e135cb8f6d..c8940314cceb8 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -669,8 +669,12 @@ 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)
-- 
2.40.1






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