From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20120527002618.126179553@linuxfoundation.org> Date: Sun, 27 May 2012 09:26:41 +0900 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Alan Cox Subject: [ 28/55] tty: Allow uart_register/unregister/register In-Reply-To: <20120527005203.GA2146@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alan Cox commit 1e66cded334e6cea596c72f6f650eec351b1e959 upstream. This is legitimate but because we don't clear the drv->state pointer in the unregister code causes a bogus BUG(). Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=42880 Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_core.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2325,6 +2325,7 @@ void uart_unregister_driver(struct uart_ tty_unregister_driver(p); put_tty_driver(p); kfree(drv->state); + drv->state = NULL; drv->tty_driver = NULL; }