linux-kernel - [PATCH 2/3] net: macb: move checksum clearing outside of spinlock

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Date:   Tue, 7 Aug 2018 12:25:13 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <nicolas.ferre@...rochip.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <harinik@...inx.com>, <jennifer.dahm@...com>,
        <nathan.sullivan@...com>, <rafalo@...ence.com>,
        <harinikatakamlinux@...il.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 2/3] net: macb: move checksum clearing outside of spinlock

Move checksum clearing outside of spinlock. The SKB is protected by
networking lock (HARD_TX_LOCK()).

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 860436474c3e..1c12afe4a0ce 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1662,6 +1662,11 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	bool is_lso, is_udp = 0;
 	netdev_tx_t ret = NETDEV_TX_OK;
 
+	if (macb_clear_csum(skb)) {
+		dev_kfree_skb_any(skb);
+		return ret;
+	}
+
 	is_lso = (skb_shinfo(skb)->gso_size != 0);
 
 	if (is_lso) {
@@ -1717,11 +1722,6 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		return NETDEV_TX_BUSY;
 	}
 
-	if (macb_clear_csum(skb)) {
-		dev_kfree_skb_any(skb);
-		goto unlock;
-	}
-
 	/* Map socket buffer for DMA transfer */
 	if (!macb_tx_map(bp, queue, skb, hdrlen)) {
 		dev_kfree_skb_any(skb);
-- 
2.7.4