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>

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 6bc20d77395e1ddbc39d298fd84c1f61be043180..de5e33fc129021be7bb7ff2ed8bde4b0f4de5552 100644 (file)
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2325,6 +2325,7 @@ 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;
 }