linux-kernel - [PATCH AUTOSEL for 4.9 08/54] net: systemport: Utilize skb_put

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Date:   Wed, 22 Nov 2017 22:23:52 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 08/54] net: systemport: Utilize
 skb_put_padto()

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream commit bb7da333d0a9f3bddc08f84187b7579a3f68fd24 ]

Since we need to pad our packets, utilize skb_put_padto() which
increases skb->len by how much we need to pad, allowing us to eliminate
the test on skb->len right below.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/net/ethernet/broadcom/bcmsysport.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index be7ec5a76a54..c89e89979267 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -1039,13 +1039,12 @@ static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
 	 * (including FCS and tag) because the length verification is done after
 	 * the Broadcom tag is stripped off the ingress packet.
 	 */
-	if (skb_padto(skb, ETH_ZLEN + ENET_BRCM_TAG_LEN)) {
+	if (skb_put_padto(skb, ETH_ZLEN + ENET_BRCM_TAG_LEN)) {
 		ret = NETDEV_TX_OK;
 		goto out;
 	}
 
-	skb_len = skb->len < ETH_ZLEN + ENET_BRCM_TAG_LEN ?
-			ETH_ZLEN + ENET_BRCM_TAG_LEN : skb->len;
+	skb_len = skb->len;
 
 	mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
 	if (dma_mapping_error(kdev, mapping)) {
-- 
2.11.0