From bbef1aa7208841df7b7075c8c4024cb8ae573dcd Mon Sep 17 00:00:00 2001
From: hwg <hwg@rock-chips.com>
Date: Sat, 8 Jun 2013 19:32:04 +0800
Subject: [PATCH] modify cdc_ether for usb dma data align: support rtl8152B usb
 ethernet

---
 drivers/net/usb/cdc_ether.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 544c309e0d95..5fe4f5bcf917 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -460,6 +460,23 @@ static int cdc_manage_power(struct usbnet *dev, int on)
 	return 0;
 }
 
+static struct sk_buff *android_tx_fixup(struct usbnet *dev,
+					struct sk_buff *skb,
+					gfp_t flags)
+{
+	struct sk_buff *tx_skb;
+
+	if ((unsigned long)skb->data % 4) {
+		tx_skb = alloc_skb(skb->len + NET_IP_ALIGN, flags);
+		if (tx_skb)
+			memcpy(skb_put(tx_skb, skb->len), skb->data, skb->len);
+		dev_kfree_skb_any(skb);
+	} else
+		tx_skb = skb;
+
+	return tx_skb;
+}
+
 static const struct driver_info	cdc_info = {
 	.description =	"CDC Ethernet Device",
 	.flags =	FLAG_ETHER | FLAG_POINTTOPOINT,
@@ -468,6 +485,7 @@ static const struct driver_info	cdc_info = {
 	.unbind =	usbnet_cdc_unbind,
 	.status =	usbnet_cdc_status,
 	.manage_power =	cdc_manage_power,
+        .tx_fixup =	android_tx_fixup,
 };
 
 static const struct driver_info wwan_info = {
-- 
2.34.1