net: dsa: tag_lan9303: let DSA core deal with TX reallocation

[ Upstream commit 6ed94135f58372cdec34cafb60f7596893b0b371 ]

Now that we have a central TX reallocation procedure that accounts for
the tagger's needed headroom in a generic way, we can remove the
skb_cow_head call.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index ccfb6f641bbfbfd8d2c446c9d2d03138f4e9d1c2..aa1318dccaf0a3b360ed4fb7549b55e77cd0f5ca 100644 (file)
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -58,15 +58,6 @@ static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev)
        __be16 *lan9303_tag;
        u16 tag;
 
-       /* insert a special VLAN tag between the MAC addresses
-        * and the current ethertype field.
-        */
-       if (skb_cow_head(skb, LAN9303_TAG_LEN) < 0) {
-               dev_dbg(&dev->dev,
-                       "Cannot make room for the special tag. Dropping packet\n");
-               return NULL;
-       }
-
        /* provide 'LAN9303_TAG_LEN' bytes additional space */
        skb_push(skb, LAN9303_TAG_LEN);