coresight: of_get_coresight_platform_data: Add missing of_node_put

The of_get_coresight_platform_data iterates over the possible CPU nodes
to find a given cpu phandle. However it does not drop the reference
to the node pointer returned by the of_get_coresight_platform_data.

This patch also introduces another minor fix is to use
of_cpu_device_node_get() to replace of_get_cpu_node().

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
[Leo: minor tweaks for of_get_coresight_platform_data]
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/coresight/of_coresight.c

@@ -109,7 +109,8 @@ of_get_coresight_platform_data(struct device *dev,
 	struct coresight_platform_data *pdata;
 	struct of_endpoint endpoint, rendpoint;
 	struct device *rdev;
-	struct device_node *dn;
+	bool found;
+	struct device_node *dn, *np;
 	struct device_node *ep = NULL;
 	struct device_node *rparent = NULL;
 	struct device_node *rport = NULL;
@@ -176,17 +177,19 @@ of_get_coresight_platform_data(struct device *dev,
 		} while (ep);
 	}
 
-	/* Affinity defaults to CPU0 */
-	pdata->cpu = 0;
 	dn = of_parse_phandle(node, "cpu", 0);
-	for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
-		if (dn == of_get_cpu_node(cpu, NULL)) {
-			pdata->cpu = cpu;
+	for_each_possible_cpu(cpu) {
+		np = of_cpu_device_node_get(cpu);
+		found = (dn == np);
+		of_node_put(np);
+		if (found)
 			break;
-		}
 	}
 	of_node_put(dn);
 
+	/* Affinity to CPU0 if no cpu nodes are found */
+	pdata->cpu = found ? cpu : 0;
+
 	return pdata;
 }
 EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);