USB: serial: sierra driver zero length packet fix

- Fixed a problem with transferring packets with size a multiple of Bulk
  Xfer size in function sierra_write(). Added transfer flag
  URB_ZERO_PACKET before submitting the urb to trigger Zero-length data
  transfer when packet size is a multiple of Bulk Xfer.

Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index f494c5f659e..9d11fe47633 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -17,7 +17,7 @@
   Whom based his on the Keyspan driver by Hugh Blemings <hugh@blemings.org>
 */
 
-#define DRIVER_VERSION "v.1.3.6"
+#define DRIVER_VERSION "v.1.3.7"
 #define DRIVER_AUTHOR "Kevin Lloyd, Elina Pasheva, Matthew Safar, Rory Filer"
 #define DRIVER_DESC "USB Driver for Sierra Wireless USB modems"
 
@@ -474,6 +474,9 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
                                           port->bulk_out_endpointAddress),
                           buffer, writesize, sierra_outdat_callback, port);
 
+        /* Handle the need to send a zero length packet */
+        urb->transfer_flags |= URB_ZERO_PACKET;
+
         /* send it down the pipe */
         retval = usb_submit_urb(urb, GFP_ATOMIC);
         if (retval) {