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CDC NCM: Add mising short packet in cdc_ncm driver

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Changes:
- while making NTB, driver shall check if device dwNtbOutMaxSize is higher than
 host value and shall add a short packet if this is the case
- previous temporary patch for this issue is replaced by this one

Signed-off-by: Alexey Orishko <alexey.orishko@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Orishko 2011-05-06 03:01:30 +00:00 committed by David S. Miller
parent c92f5ca2e5
commit 6c60408e33
1 changed files with 8 additions and 5 deletions
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13
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 "23-Apr-2011"
#define DRIVER_VERSION "06-May-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 + 4) /* bytes, must be short terminated */
#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */
#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */
/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
@ -722,7 +722,7 @@ cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
} else {
/* reset variables */
skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC);
skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC);
if (skb_out == NULL) {
if (skb != NULL) {
dev_kfree_skb_any(skb);
@ -861,8 +861,11 @@ cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb)
/* store last offset */
last_offset = offset;
if ((last_offset < ctx->tx_max) && ((last_offset %
le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) {
if (((last_offset < ctx->tx_max) && ((last_offset %
le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) ||
(((last_offset == ctx->tx_max) && ((ctx->tx_max %
le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) &&
(ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) {
/* force short packet */
*(((u8 *)skb_out->data) + last_offset) = 0;
last_offset++;