USB: make sure usb serial drivers don't flush to logically disconnected devices

[linux-2.6-omap-h63xx.git] / drivers / usb / serial / whiteheat.c

diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index f5033d482eeec1060fd57fbb85388503ad405e40..38726ef3132b70d83121d8bdaa894b47990f0843 100644 (file)
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -658,11 +658,14 @@ static void whiteheat_close(struct usb_serial_port *port, struct file * filp)
        struct list_head *tmp2;
 
        dbg("%s - port %d", __FUNCTION__, port->number);
-       
+
+       mutex_lock(&port->serial->disc_mutex);
        /* filp is NULL when called from usb_serial_disconnect */
-       if (filp && (tty_hung_up_p(filp))) {
+       if ((filp && (tty_hung_up_p(filp))) || port->serial->disconnected) {
+               mutex_unlock(&port->serial->disc_mutex);
                return;
        }
+       mutex_unlock(&port->serial->disc_mutex);
 
        port->tty->closing = 1;