From 880bca3a2a6f159d7453e0cbcbfe2f1d8204d907 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= <bjorn@mork.no>
Date: Mon, 30 Apr 2012 09:26:11 +0200
Subject: USB: cdc-wdm: add debug messages on cleanup
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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>

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 650e1da..4e8451c 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);
 }
 
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