netdev - [PATCH net 2/3] net: dsa: rtl4_a: Drop skb_cow

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Message-Id: <20210301133241.1277164-2-linus.walleij@linaro.org>
Date:   Mon,  1 Mar 2021 14:32:40 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
        DENG Qingfang <dqfext@...il.com>,
        Mauri Sandberg <sandberg@...lfence.com>
Subject: [PATCH net 2/3] net: dsa: rtl4_a: Drop skb_cow_head()

The DSA core already provides the tag headroom, drop this.

Fixes: 86dd9868b878 ("net: dsa: tag_rtl4_a: Support also egress tags")
Reported-by: Andrew Lunn <andrew@...n.ch>
Reported-by: DENG Qingfang <dqfext@...il.com>
Cc: Mauri Sandberg <sandberg@...lfence.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 net/dsa/tag_rtl4_a.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/dsa/tag_rtl4_a.c b/net/dsa/tag_rtl4_a.c
index 804d756dd80a..8098d81f660b 100644
--- a/net/dsa/tag_rtl4_a.c
+++ b/net/dsa/tag_rtl4_a.c
@@ -42,8 +42,6 @@ static struct sk_buff *rtl4a_tag_xmit(struct sk_buff *skb,
 	/* Pad out to at least 60 bytes */
 	if (__skb_put_padto(skb, ETH_ZLEN, false))
 		return NULL;
-	if (skb_cow_head(skb, RTL4_A_HDR_LEN) < 0)
-		return NULL;
 
 	netdev_dbg(dev, "add realtek tag to package to port %d\n",
 		   dp->index);
-- 
2.29.2