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cdc_ncm: fix short packet issue on some devices

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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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Hans Petter Selasky 2011-04-24 22:35:19 -07:00 • committed by David S. Miller
commit 8c61d9d611
1 changed files with 2 additions and 2 deletions
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4
drivers/net/usb/cdc_ncm.c
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@ -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 */