Subject: [PATCH 001/004] USB: serial: sierra driver zero length packet fix
From: Elina Pasheva <epasheva@xxxxxxxxxxxxxxxxxx>
The following is summary of changes we have made to sierra.c driver in
[PATCH 001/004] dealing with 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@xxxxxxxxxxxxxxxxxx>
---
drivers/usb/serial/sierra.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/usb/serial/sierra.c 2009-04-30 17:49:45.000000000 -0700
+++ b/drivers/usb/serial/sierra.c 2009-04-30 17:57:30.000000000 -0700
@@ -17,7 +17,7 @@
Whom based his on the Keyspan driver by Hugh Blemings <hugh@xxxxxxxxxxxx>
*/
-#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"
@@ -425,6 +425,9 @@ static int sierra_write(struct tty_struc
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) {
--
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