From: Alan Stern <stern@rowland.harvard.edu>
Date: Mon, 10 Jan 2011 16:23:05 +0000 (-0500)
Subject: USB: g_printer: fix bug in unregistration
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d5aa475180d03d45c5dc6134aa833f1b3e89c45e;p=linux-beck.git

USB: g_printer: fix bug in unregistration

This patch (as1441) fixes a bug in g_printer.  The gadget driver, char
device number, and class device should be unregistered in reverse
order of registration.  As it is now, when the module is unloaded the
class device gets unregistered first, causing a crash when the unbind
method tries to access it.

This fixes Bugzilla #25882.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Roland Kletzing <devzero@web.de>
CC: Craig W. Nadler <craig@nadler.us>
CC: <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 2fc8636316c5..dacc67724fe1 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -1596,13 +1596,12 @@ cleanup(void)
 	int status;
 
 	mutex_lock(&usb_printer_gadget.lock_printer_io);
-	class_destroy(usb_gadget_class);
-	unregister_chrdev_region(g_printer_devno, 2);
-
 	status = usb_gadget_unregister_driver(&printer_driver);
 	if (status)
 		ERROR(dev, "usb_gadget_unregister_driver %x\n", status);
 
+	unregister_chrdev_region(g_printer_devno, 2);
+	class_destroy(usb_gadget_class);
 	mutex_unlock(&usb_printer_gadget.lock_printer_io);
 }
 module_exit(cleanup);