From: Alan Cox <alan@linux.intel.com>
Date: Mon, 14 May 2012 13:51:22 +0000 (+0100)
Subject: tty: Allow uart_register/unregister/register
X-Git-Tag: v3.2.19~59
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b89d788669db009d58b2f5e9988caaaf7df9e4ab;p=karo-tx-linux.git

tty: Allow uart_register/unregister/register

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 <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 0406d7ff505e..af5ffb9154d4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2305,6 +2305,7 @@ void uart_unregister_driver(struct uart_driver *drv)
 	tty_unregister_driver(p);
 	put_tty_driver(p);
 	kfree(drv->state);
+	drv->state = NULL;
 	drv->tty_driver = NULL;
 }