linux-kernel - [RFC PATCH 2/8] coresight: Fix remote endpoint parsing

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Date:   Fri,  1 Jun 2018 14:16:01 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     mathieu.poirier@...aro.org, sudeep.holla@....com, robh@...nel.org,
        mark.rutland@....com, frowand.list@...il.com, matt.sealey@....com,
        charles.garcia-tobin@....com, john.horley@....com,
        mike.leach@...aro.org, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [RFC PATCH 2/8] coresight: Fix remote endpoint parsing

When parsing the remote endpoint of an output port, we do :
     rport = of_graph_get_remote_port(ep);
     rparent = of_graph_get_remote_port_parent(ep);

and then parse the "remote_port" as if it was the remote endpoint,
which is wrong. The code worked fine because we used endpoint number
as the port number. Let us fix it and optimise a bit as:

     remote_ep = of_graph_get_remote_endpoint(ep);
     if (remote_ep)
        remote_parent = of_graph_get_port_parent(remote_ep);

and then, parse the remote_ep for the port/endpoint details.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/of_coresight.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index 7c37544..e0deab0 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -128,7 +128,7 @@ of_get_coresight_platform_data(struct device *dev,
 	struct device *rdev;
 	struct device_node *ep = NULL;
 	struct device_node *rparent = NULL;
-	struct device_node *rport = NULL;
+	struct device_node *rep = NULL;
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -169,16 +169,17 @@ of_get_coresight_platform_data(struct device *dev,
 			pdata->outports[i] = endpoint.port;
 
 			/*
-			 * Get a handle on the remote port and parent
-			 * attached to it.
+			 * Get a handle on the remote endpoint and the device
+			 * it is attached to.
 			 */
-			rparent = of_graph_get_remote_port_parent(ep);
-			rport = of_graph_get_remote_port(ep);
-
-			if (!rparent || !rport)
+			rep = of_graph_get_remote_endpoint(ep);
+			if (!rep)
+				continue;
+			rparent = of_graph_get_port_parent(rep);
+			if (!rparent)
 				continue;
 
-			if (of_graph_parse_endpoint(rport, &rendpoint))
+			if (of_graph_parse_endpoint(rep, &rendpoint))
 				continue;
 
 			rdev = of_coresight_get_endpoint_device(rparent);
@@ -186,7 +187,7 @@ of_get_coresight_platform_data(struct device *dev,
 				return ERR_PTR(-EPROBE_DEFER);
 
 			pdata->child_names[i] = dev_name(rdev);
-			pdata->child_ports[i] = rendpoint.id;
+			pdata->child_ports[i] = rendpoint.port;
 
 			i++;
 		} while (ep);
-- 
2.7.4