[ 28/55] tty: Allow uart_register/unregister/register
From: Greg KH
Date: Sat May 26 2012 - 20:59:16 EST
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alan Cox <alan@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
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