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    Subject[ 058/117] tty: Allow uart_register/unregister/register
    3.2-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Alan Cox <alan@linux.intel.com>

    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>
    ---
    drivers/tty/serial/serial_core.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
    index 59fb3ba..a21dc8e 100644
    --- a/drivers/tty/serial/serial_core.c
    +++ b/drivers/tty/serial/serial_core.c
    @@ -2282,6 +2282,7 @@ 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;
    }




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