USB: add usb debugfs directory

Add a common usb directory in debugfs that the usb subsystem can use.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 25 insertions, 0 deletions

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 7eee400d3e32..5f6873f5f268 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -34,6 +34,7 @@
 #include <linux/usb.h>
 #include <linux/mutex.h>
 #include <linux/workqueue.h>
+#include <linux/debugfs.h>
 
 #include <asm/io.h>
 #include <linux/scatterlist.h>
@@ -1001,6 +1002,22 @@ static struct notifier_block usb_bus_nb = {
         .notifier_call = usb_bus_notify,
 };
 
+struct dentry *usb_debug_root;
+EXPORT_SYMBOL_GPL(usb_debug_root);
+
+static int usb_debugfs_init(void)
+{
+        usb_debug_root = debugfs_create_dir("usb", NULL);
+        if (!usb_debug_root)
+                return -ENOENT;
+        return 0;
+}
+
+static void usb_debugfs_cleanup(void)
+{
+        debugfs_remove(usb_debug_root);
+}
+
 /*
  * Init
  */
@@ -1012,6 +1029,10 @@ static int __init usb_init(void)
                 return 0;
         }
 
+        retval = usb_debugfs_init();
+        if (retval)
+                goto out;
+
         retval = ksuspend_usb_init();
         if (retval)
                 goto out;
@@ -1083,6 +1104,7 @@ static void __exit usb_exit(void)
         bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
         bus_unregister(&usb_bus_type);
         ksuspend_usb_cleanup();
+        usb_debugfs_cleanup();
 }
 
 subsys_initcall(usb_init);
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 3aa2cd1f8d08..29060dad81e6 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1558,6 +1558,9 @@ extern void usb_unregister_notify(struct notifier_block *nb);
 #define err(format, arg...) printk(KERN_ERR KBUILD_MODNAME ": " \
         format "\n" , ## arg)
 
+/* debugfs stuff */
+extern struct dentry *usb_debug_root;
+
 #endif  /* __KERNEL__ */
 
 #endif