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/ipw.c b/drivers/usb/serial/ipw.c
index 87306cb6f9f5..812bc213a963 100644
--- a/drivers/usb/serial/ipw.c
+++ b/drivers/usb/serial/ipw.c
@@ -394,14 +394,14 @@ static int ipw_write(struct usb_serial_port *port, const unsigned char *buf, int
                 return 0;
         }
 
-        spin_lock(&port->lock);
+        spin_lock_bh(&port->lock);
         if (port->write_urb_busy) {
-                spin_unlock(&port->lock);
+                spin_unlock_bh(&port->lock);
                 dbg("%s - already writing", __FUNCTION__);
                 return 0;
         }
         port->write_urb_busy = 1;
-        spin_unlock(&port->lock);
+        spin_unlock_bh(&port->lock);
 
         count = min(count, port->bulk_out_size);
         memcpy(port->bulk_out_buffer, buf, count);