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From:   Anshuman Khandual <anshuman.khandual@arm.com>
To:     linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
        suzuki.poulose@arm.com, gregkh@linuxfoundation.org,
        rafael@kernel.org
Cc:     Anshuman Khandual <anshuman.khandual@arm.com>,
        Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
        Steve Clevenger <scclevenger@os.amperecomputing.com>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Len Brown <lenb@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Mike Leach <mike.leach@linaro.org>,
        Leo Yan <leo.yan@linaro.org>, devicetree@vger.kernel.org,
        linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH V6 5/6] coresight: platform: acpi: Ignore the absence of graph
Date:   Mon, 10 Jul 2023 11:54:59 +0530
Message-Id: <20230710062500.45147-6-anshuman.khandual@arm.com>
In-Reply-To: <20230710062500.45147-1-anshuman.khandual@arm.com>
References: <20230710062500.45147-1-anshuman.khandual@arm.com>
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From: Suzuki K Poulose <suzuki.poulose@arm.com>

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>
---
 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 3e2e135cb8f6..c8940314cceb 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)
-- 
2.25.1