On Fri, Mar 20, 2026 at 03:31:12PM +0800, Jie Gan wrote:
Check endpoint availability before parsing it. If parsing a connected endpoint fails, the probe is deferred until the endpoint becomes available, or eventually fails.
I want to clarify a bit the failure flow.
Does this mean coresight_find_device_by_fwnode() returns NULL when the remote device is not found, resulting in -EPROBE_DEFER, but the probe never waits for the remote device to become available?
In some legacy cases, a replicator has two output ports where one is disabled and the other is available. The replicator probe always fails because the disabled endpoint never becomes available for parsing. In addition, there is no need to defer probing a device that is connected to a disabled device, which improves probe performance.
Signed-off-by: Jie Gan jie.gan@oss.qualcomm.com
drivers/hwtracing/coresight/coresight-platform.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c index 0ca3bd762454..e337b6e2bf32 100644 --- a/drivers/hwtracing/coresight/coresight-platform.c +++ b/drivers/hwtracing/coresight/coresight-platform.c @@ -220,6 +220,8 @@ static int of_coresight_parse_endpoint(struct device *dev, rparent = of_coresight_get_port_parent(rep); if (!rparent) break;
if (!of_device_is_available(rparent))break;
base-commit: b5d083a3ed1e2798396d5e491432e887da8d4a06 change-id: 20260320-add-availability-check-4cb2ee6e520b
Best regards,
Jie Gan jie.gan@oss.qualcomm.com
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Leo Yan