From: Bjørn Mork <bjorn@mork.no>
Date: Thu, 3 Dec 2015 18:24:20 +0000 (+0100)
Subject: usbnet: allow mini-drivers to consume L2 headers
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=81e0ce79f2919dbd5f025894d29aa806af8695c7;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

usbnet: allow mini-drivers to consume L2 headers

Assume the minidriver has taken care of all L2 header parsing
if it sets skb->protocol.  This allows the minidriver to
support non-ethernet L2 headers, and even operate without
any L2 header at all.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 0744bf2ef2d6..0b0ba7ef14e4 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -324,7 +324,10 @@ void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
 		return;
 	}
 
-	skb->protocol = eth_type_trans (skb, dev->net);
+	/* only update if unset to allow minidriver rx_fixup override */
+	if (skb->protocol == 0)
+		skb->protocol = eth_type_trans (skb, dev->net);
+
 	dev->net->stats.rx_packets++;
 	dev->net->stats.rx_bytes += skb->len;