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    Subject[PATCH 3.4 072/134] USB: serial: fix hang when opening port
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

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

    From: Ming Lei <tom.leiming@gmail.com>

    commit eba0e3c3a0ba7b96f01cbe997680f6a4401a0bfc upstream.

    Johan's 'fix use-after-free in TIOCMIWAIT' patchset[1] introduces
    one bug which can cause kernel hang when opening port.

    This patch initialized the 'port->delta_msr_wait' waitqueue head
    to fix the bug which is introduced in 3.9-rc4.

    [1], http://marc.info/?l=linux-usb&m=136368139627876&w=2

    Signed-off-by: Ming Lei <tom.leiming@gmail.com>
    Acked-by: Johan Hovold <jhovold@gmail.com>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    Cc: Yang Yingliang <yangyingliang@huawei.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/serial/usb-serial.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/usb/serial/usb-serial.c
    +++ b/drivers/usb/serial/usb-serial.c
    @@ -908,6 +908,7 @@ int usb_serial_probe(struct usb_interfac
    port->port.ops = &serial_port_ops;
    port->serial = serial;
    spin_lock_init(&port->lock);
    + init_waitqueue_head(&port->delta_msr_wait);
    /* Keep this for private driver use for the moment but
    should probably go away */
    INIT_WORK(&port->work, usb_serial_port_work);



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