cdc_ncm: fix short packet issue on some devices
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@c2i.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -54,13 +54,13 @@
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#include <linux/usb/usbnet.h>
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#include <linux/usb/cdc.h>
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#define DRIVER_VERSION "7-Feb-2011"
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#define DRIVER_VERSION "23-Apr-2011"
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/* CDC NCM subclass 3.2.1 */
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#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10
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/* Maximum NTB length */
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#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */
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#define CDC_NCM_NTB_MAX_SIZE_TX (16384 + 4) /* bytes, must be short terminated */
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#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */
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/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
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