USB: cdc-wdm: add debug messages on cleanup

Device state cleanup is done in either wdm_disconnect or
wdm_release depending on the order they are called. Adding
a couple of debug messages to document the program flow.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 650e1da4d2bf..4e8451ca2d6c 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -620,10 +620,12 @@ static int wdm_release(struct inode *inode, struct file *file)
         if (!desc->count) {
                 dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
                 kill_urbs(desc);
-                if (!test_bit(WDM_DISCONNECTING, &desc->flags))
+                if (!test_bit(WDM_DISCONNECTING, &desc->flags)) {
                         desc->manage_power(desc->intf, 0);
-                else
+                } else {
+                        dev_dbg(&desc->intf->dev, "%s: device gone - cleaning up\n", __func__);
                         cleanup(desc);
+                }
         }
         mutex_unlock(&wdm_mutex);
         return 0;
@@ -897,6 +899,8 @@ static void wdm_disconnect(struct usb_interface *intf)
         mutex_unlock(&desc->rlock);
         if (!desc->count)
                 cleanup(desc);
+        else
+                dev_dbg(&intf->dev, "%s: %d open files - postponing cleanup\n", __func__, desc->count);
         mutex_unlock(&wdm_mutex);
 }