USB: serial: clear fifo on close

Make sure fifo is emptied on close.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 2a3196a2c66c..583244bd84b1 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -156,13 +156,19 @@ EXPORT_SYMBOL_GPL(usb_serial_generic_open);
 static void generic_cleanup(struct usb_serial_port *port)
 {
         struct usb_serial *serial = port->serial;
+        unsigned long flags;
 
         dbg("%s - port %d", __func__, port->number);
 
         if (serial->dev) {
                 /* shutdown any bulk transfers that might be going on */
-                if (port->bulk_out_size)
+                if (port->bulk_out_size) {
                         usb_kill_urb(port->write_urb);
+
+                        spin_lock_irqsave(&port->lock, flags);
+                        kfifo_reset_out(&port->write_fifo);
+                        spin_unlock_irqrestore(&port->lock, flags);
+                }
                 if (port->bulk_in_size)
                         usb_kill_urb(port->read_urb);
         }