Since commit ea812ca1b06113597adcd8e70c0f84a413d97544 (x86: Align skb w/ start
of cacheline on newer core 2/Xeon Arch), NET_IP_ALIGN changed from 2 to 0, and
the constant is used to reserve more room for the socket buffer.
Some people have reported that tethering stopped working and David Hill
submited a patch that redefined NET_IP_ALIGN. Pointed by Ben Hutchings, the
patch has been reworked to use a private constant.
I have no more an iPhone device to test it, so it is only compile-tested.
Signed-off-by: L. Alberto GimÃnez <agimenez@xxxxxxxxxxx>
---
drivers/net/usb/ipheth.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
index 7d42f9a..8f1ffc7 100644
--- a/drivers/net/usb/ipheth.c
+++ b/drivers/net/usb/ipheth.c
@@ -80,6 +80,8 @@
#define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
#define IPHETH_CARRIER_ON 0x04
+#define IPHETH_IP_ALIGN 2
+
static struct usb_device_id ipheth_table[] = {
{ USB_DEVICE_AND_INTERFACE_INFO(
USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
@@ -205,15 +207,15 @@ static void ipheth_rcvbulk_callback(struct urb *urb)
len = urb->actual_length;
buf = urb->transfer_buffer;
- skb = dev_alloc_skb(NET_IP_ALIGN + len);
+ skb = dev_alloc_skb(IPHETH_IP_ALIGN + len);
if (!skb) {
err("%s: dev_alloc_skb: -ENOMEM", __func__);
dev->net->stats.rx_dropped++;
return;
}
- skb_reserve(skb, NET_IP_ALIGN);
- memcpy(skb_put(skb, len), buf + NET_IP_ALIGN, len - NET_IP_ALIGN);
+ skb_reserve(skb, IPHETH_IP_ALIGN);
+ memcpy(skb_put(skb, len), buf + IPHETH_IP_ALIGN, len - IPHETH_IP_ALIGN);
skb->dev = dev->net;
skb->protocol = eth_type_trans(skb, dev->net);
--
1.7.5
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