From 6c60408e33aba6d1d7241bc9be3b8d1b39509291 Mon Sep 17 00:00:00 2001 From: Alexey Orishko Date: Fri, 6 May 2011 03:01:30 +0000 Subject: [PATCH] CDC NCM: Add mising short packet in cdc_ncm driver 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 Signed-off-by: David S. Miller --- drivers/net/usb/cdc_ncm.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 1033ef6..4ab557d 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -54,13 +54,13 @@ #include #include -#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++; -- 2.7.4