linux-kernel - [PATCH] cdc_ncm: fix short packet issue on some devices

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Date:	Sun, 24 Apr 2011 16:59:30 -0700
From:	Greg KH <greg@...ah.com>
To:	netdev@...r.kernel.org
Cc:	Oliver Neukum <oliver@...kum.name>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hans Petter Selasky <hselasky@....net>
Subject: [PATCH] cdc_ncm: fix short packet issue on some devices

From: Hans Petter Selasky <hselasky@....net>

The default maximum transmit length for NCM USB frames should be so
that a short packet happens at the end if the device supports a length
greater than the defined maximum. This is achieved by adding 4 bytes
to the maximum length so that the existing logic can fit a short
packet there.

Signed-off-by: Hans Petter Selasky <hselasky@....net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/net/usb/cdc_ncm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 967371f..1033ef6 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -54,13 +54,13 @@
 #include <linux/usb/usbnet.h>
 #include <linux/usb/cdc.h>
 
-#define	DRIVER_VERSION				"7-Feb-2011"
+#define	DRIVER_VERSION				"23-Apr-2011"
 
 /* CDC NCM subclass 3.2.1 */
 #define USB_CDC_NCM_NDP16_LENGTH_MIN		0x10
 
 /* Maximum NTB length */
-#define	CDC_NCM_NTB_MAX_SIZE_TX			16384	/* bytes */
+#define	CDC_NCM_NTB_MAX_SIZE_TX			(16384 + 4) /* bytes, must be short terminated */
 #define	CDC_NCM_NTB_MAX_SIZE_RX			16384	/* bytes */
 
 /* Minimum value for MaxDatagramSize, ch. 6.2.9 */
-- 
1.7.1.1

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