Re: CDC NCM missing Zero Length Packets

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On Sunday 24 April 2011 17:29:16 Greg KH wrote:
> On Sun, Apr 24, 2011 at 05:19:12PM +0200, Marius Kotsbak wrote:
> > Den 24. april 2011 16:30, skrev Hans Petter Selasky:
> > >>But I do need a signed-off-by line for this.
> > >
> > >What should I put as signed-off-by ?
> > 
> > Add this flag to the git commit command:
> > 
> > -s, --signoff
> > 
> >            Add Signed-off-by line by the committer at the end of the
> > 
> > commit log message.
> > 
> > (use --amend / rebase -i to add it to an existing commit)
> 
> That's one way of doing it, but I think the original question is "what"
> is a signed-off-by line, which is more important.
> 
> Hans, see the file in the kernel source tree,
> Documentation/SubmittingPatches for details as to what you are agreeing
> with when adding your signed-off-by to a patch.  That should explain
> it in detail, and if you have any further questions about it, please let
> us know.

Hi,

Got it!

I also tried to fix the line-wrapping of the commit message.

See attachment.

--HPS
From 32b84c3cfc7d82cb27b31255ed63bc8bb0e15262 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hselasky@xxxxxxx>
Date: Sat, 23 Apr 2011 19:20:41 +0200
Subject: [PATCH] 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@xxxxxxx>
---
 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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