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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>
hifive-unleashed-5.1
Elina Pasheva 2009-05-12 13:12:24 -07:00 committed by Greg Kroah-Hartman
parent 72fda3ca6f
commit 238ebd138c
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/serial/sierra.c
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@ -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) {