coresight: Add return value for fixup connections

Handle failures in fixing up connections for a newly registered
device. This will be useful to handle cases where we fail to expose
the links via sysfs for the connections.
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200518180242.7916-3-mathieu.poirier@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/coresight/coresight.c

@@ -1073,18 +1073,14 @@ static int coresight_orphan_match(struct device *dev, void *data)
 	return 0;
 }
 
-static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
+static int coresight_fixup_orphan_conns(struct coresight_device *csdev)
 {
-	/*
-	 * No need to check for a return value as orphan connection(s)
-	 * are hooked-up with each newly added component.
-	 */
-	bus_for_each_dev(&coresight_bustype, NULL,
+	return bus_for_each_dev(&coresight_bustype, NULL,
 			 csdev, coresight_orphan_match);
 }
 
 
-static void coresight_fixup_device_conns(struct coresight_device *csdev)
+static int coresight_fixup_device_conns(struct coresight_device *csdev)
 {
 	int i;
 
@@ -1096,6 +1092,8 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
 		if (!conn->child_dev)
 			csdev->orphan = true;
 	}
+
+	return 0;
 }
 
 static int coresight_remove_match(struct device *dev, void *data)
@@ -1305,11 +1303,17 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 
 	mutex_lock(&coresight_mutex);
 
-	coresight_fixup_device_conns(csdev);
-	coresight_fixup_orphan_conns(csdev);
-	cti_add_assoc_to_csdev(csdev);
+	ret = coresight_fixup_device_conns(csdev);
+	if (!ret)
+		ret = coresight_fixup_orphan_conns(csdev);
+	if (!ret)
+		cti_add_assoc_to_csdev(csdev);
 
 	mutex_unlock(&coresight_mutex);
+	if (ret) {
+		coresight_unregister(csdev);
+		return ERR_PTR(ret);
+	}
 
 	return csdev;