From 405701e8e98599c0c68ac174547b6663d2b536bd Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Mon, 10 Jan 2011 11:23:05 -0500 Subject: [PATCH] USB: g_printer: fix bug in unregistration 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 CC: Roland Kletzing CC: Craig W. Nadler Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/printer.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) 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); -- 2.39.5