1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index bbe005cefcfb..61eef18218be 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -285,7 +285,7 @@ static int usb_serial_generic_write_start(struct usb_serial_port *port)
                 return 0;
 
         data = port->write_urb->transfer_buffer;
-        count = kfifo_get(port->write_fifo, data, port->bulk_out_size);
+        count = kfifo_get_locked(port->write_fifo, data, port->bulk_out_size, &port->lock);
         usb_serial_debug_data(debug, &port->dev, __func__, count, data);
 
         /* set up our urb */
@@ -345,7 +345,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
                 return usb_serial_multi_urb_write(tty, port,
                                                   buf, count);
 
-        count = kfifo_put(port->write_fifo, buf, count);
+        count = kfifo_put_locked(port->write_fifo, buf, count, &port->lock);
         result = usb_serial_generic_write_start(port);
 
         if (result >= 0)