This is a note to let you know that I've just added the patch titled
coresight: platform: acpi: Ignore the absence of graph
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
coresight-platform-acpi-ignore-the-absence-of-graph.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 54bcee216cd761c525f40f34e072a930002566e6
Author: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Date: Mon Jul 10 11:54:59 2023 +0530
coresight: platform: acpi: Ignore the absence of graph
[ 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>
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)
