usb-serial: possible irq lock inversion (PPP vs. usb/serial)

=========================================================
[ INFO: possible irq lock inversion dependency detected ]

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index 49b8dc039d1f..59e777f1e8fd 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -518,13 +518,13 @@ static int keyspan_pda_write(struct usb_serial_port *port,
            the TX urb is in-flight (wait until it completes)
            the device is full (wait until it says there is room)
         */
-        spin_lock(&port->lock);
+        spin_lock_bh(&port->lock);
         if (port->write_urb_busy || priv->tx_throttled) {
-                spin_unlock(&port->lock);
+                spin_unlock_bh(&port->lock);
                 return 0;
         }
         port->write_urb_busy = 1;
-        spin_unlock(&port->lock);
+        spin_unlock_bh(&port->lock);
 
         /* At this point the URB is in our control, nobody else can submit it
            again (the only sudden transition was the one from EINPROGRESS to