commit 5451ea0e99cb7d58cbf90c7785cb50cc322a4434
author Alex Elder <elder@linaro.org> Mon May 23 23:05:31 2016 -0500
committer Greg Kroah-Hartman <gregkh@google.com> Thu May 26 22:37:19 2016 -0700
tree d2f234e099db0eeb91e426f8732e41776899ffb9
parent 1f79046bd73abf5cc1dc5ad1f817a7851496ae0c

greybus: tracing: add module traces

Define a new gb_module trace point event class, used to trace events
associated with the module abstraction.  Define four basic trace
points for this--creation time, drop of last reference, before
registring interfaces and after de-registering them.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/module.c

diff --git a/drivers/staging/greybus/module.c b/drivers/staging/greybus/module.c
index ea58954..c56b988 100644
--- a/drivers/staging/greybus/module.c
+++ b/drivers/staging/greybus/module.c
@@ -9,6 +9,7 @@
 
 #include "greybus.h"
 
+#include "greybus_trace.h"
 
 static ssize_t eject_store(struct device *dev,
 				struct device_attribute *attr,
@@ -77,6 +78,8 @@
 {
 	struct gb_module *module = to_gb_module(dev);
 
+	trace_gb_module_release(module);
+
 	kfree(module);
 }
 
@@ -109,6 +112,8 @@
 	device_initialize(&module->dev);
 	dev_set_name(&module->dev, "%d-%u", hd->bus_id, module_id);
 
+	trace_gb_module_create(module);
+
 	for (i = 0; i < num_interfaces; ++i) {
 		intf = gb_interface_create(module, module_id + i);
 		if (!intf) {
@@ -215,6 +220,8 @@
 		return ret;
 	}
 
+	trace_gb_module_add(module);
+
 	for (i = 0; i < module->num_interfaces; ++i)
 		gb_module_register_interface(module->interfaces[i]);
 
@@ -229,6 +236,8 @@
 	for (i = 0; i < module->num_interfaces; ++i)
 		gb_module_deregister_interface(module->interfaces[i]);
 
+	trace_gb_module_del(module);
+
 	device_del(&module->dev);
 }