linux-kernel - [026/272] USB: g_printer: fix bug in unregistration

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Message-Id: <20110216001427.636758941@clark.kroah.org>
Date:	Tue, 15 Feb 2011 16:11:23 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alan Stern <stern@...land.harvard.edu>,
	Roland Kletzing <devzero@....de>,
	"Craig W. Nadler" <craig@...ler.us>
Subject: [026/272] USB: g_printer: fix bug in unregistration

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Alan Stern <stern@...land.harvard.edu>

commit d5aa475180d03d45c5dc6134aa833f1b3e89c45e upstream.

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@...land.harvard.edu>
CC: Roland Kletzing <devzero@....de>
CC: Craig W. Nadler <craig@...ler.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/gadget/printer.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- 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);


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