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Date: Tue, 5 Jun 2018 22:43:13 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: mathieu.poirier@...aro.org, robh@...nel.org,
frowand.list@...il.com, mark.rutland@....com, sudeep.holla@....com,
arm@...nel.org, linux-kernel@...r.kernel.org, matt.sealey@....com,
john.horley@....com, charles.garcia-tobin@....com,
coresight@...ts.linaro.org, devicetree@...r.kernel.org,
mike.leach@...aro.org, Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 02/20] coresight: of: Fix refcounting for graph nodes
The coresight driver doesn't drop the references on the
remote endpoint/port nodes. Add the missing of_node_put()
calls. To make it easier to handle different corner cases
cleanly, move the parsing of an endpoint to separate
function.
Reported-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
drivers/hwtracing/coresight/of_coresight.c | 139 +++++++++++++++++------------
1 file changed, 84 insertions(+), 55 deletions(-)
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index a33a92e..8a23c63 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -111,17 +111,80 @@ int of_coresight_get_cpu(const struct device_node *node)
}
EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
+/*
+ * of_coresight_parse_endpoint : Parse the given output endpoint @ep
+ * and fill the connection information in @pdata[*@i].
+ *
+ * Parses the local port, remote device name and the remote port. Also
+ * updates *@i to point to the next index, when an entry is added.
+ *
+ * Returns :
+ * 0 - If the parsing completed without any fatal errors.
+ * -Errno - Fatal error, abort the scanning.
+ */
+static int of_coresight_parse_endpoint(struct device_node *ep,
+ struct coresight_platform_data *pdata,
+ int *i)
+{
+ int ret = 0;
+ struct of_endpoint endpoint, rendpoint;
+ struct device_node *rparent = NULL;
+ struct device_node *rport = NULL;
+ struct device *rdev = NULL;
+
+ do {
+ /*
+ * No need to deal with input ports, processing for as
+ * processing for output ports will deal with them.
+ */
+ if (of_find_property(ep, "slave-mode", NULL))
+ break;
+
+ /* Parse the local port details */
+ if (of_graph_parse_endpoint(ep, &endpoint))
+ break;
+ /*
+ * Get a handle on the remote port and parent
+ * attached to it.
+ */
+ rparent = of_graph_get_remote_port_parent(ep);
+ if (!rparent)
+ break;
+ rport = of_graph_get_remote_port(ep);
+ if (!rport)
+ break;
+ if (of_graph_parse_endpoint(rport, &rendpoint))
+ break;
+
+ /* If the remote device is not available, defer probing */
+ rdev = of_coresight_get_endpoint_device(rparent);
+ if (!rdev) {
+ ret = -EPROBE_DEFER;
+ break;
+ }
+
+ pdata->outports[*i] = endpoint.port;
+ pdata->child_names[*i] = dev_name(rdev);
+ pdata->child_ports[*i] = rendpoint.id;
+ /* Move the index */
+ (*i)++;
+ } while (0);
+
+ if (rparent)
+ of_node_put(rparent);
+ if (rport)
+ of_node_put(rport);
+
+ return ret;
+}
+
struct coresight_platform_data *
of_get_coresight_platform_data(struct device *dev,
const struct device_node *node)
{
int i = 0, ret = 0;
struct coresight_platform_data *pdata;
- struct of_endpoint endpoint, rendpoint;
- struct device *rdev;
struct device_node *ep = NULL;
- struct device_node *rparent = NULL;
- struct device_node *rport = NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
@@ -129,63 +192,29 @@ of_get_coresight_platform_data(struct device *dev,
/* Use device name as sysfs handle */
pdata->name = dev_name(dev);
+ pdata->cpu = of_coresight_get_cpu(node);
/* Get the number of input and output port for this component */
of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
- if (pdata->nr_outport) {
- ret = of_coresight_alloc_memory(dev, pdata);
+ /* If there are not output connections, we are done */
+ if (!pdata->nr_outport)
+ return pdata;
+
+ ret = of_coresight_alloc_memory(dev, pdata);
+ if (ret)
+ return ERR_PTR(ret);
+
+ /* Iterate through each port to discover topology */
+ do {
+ /* Get a handle on a port */
+ ep = of_graph_get_next_endpoint(node, ep);
+ if (!ep)
+ break;
+ ret = of_coresight_parse_endpoint(ep, pdata, &i);
if (ret)
return ERR_PTR(ret);
-
- /* Iterate through each port to discover topology */
- do {
- /* Get a handle on a port */
- ep = of_graph_get_next_endpoint(node, ep);
- if (!ep)
- break;
-
- /*
- * No need to deal with input ports, processing for as
- * processing for output ports will deal with them.
- */
- if (of_find_property(ep, "slave-mode", NULL))
- continue;
-
- /* Get a handle on the local endpoint */
- ret = of_graph_parse_endpoint(ep, &endpoint);
-
- if (ret)
- continue;
-
- /* The local out port number */
- pdata->outports[i] = endpoint.port;
-
- /*
- * Get a handle on the remote port and parent
- * attached to it.
- */
- rparent = of_graph_get_remote_port_parent(ep);
- rport = of_graph_get_remote_port(ep);
-
- if (!rparent || !rport)
- continue;
-
- if (of_graph_parse_endpoint(rport, &rendpoint))
- continue;
-
- rdev = of_coresight_get_endpoint_device(rparent);
- if (!rdev)
- return ERR_PTR(-EPROBE_DEFER);
-
- pdata->child_names[i] = dev_name(rdev);
- pdata->child_ports[i] = rendpoint.id;
-
- i++;
- } while (ep);
- }
-
- pdata->cpu = of_coresight_get_cpu(node);
+ } while (ep);
return pdata;
}
--
2.7.4
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