From 93fcf83eb953d9ca2d3c51ff7f87095f0dd43511 Mon Sep 17 00:00:00 2001 From: Noam Camus Date: Thu, 20 Aug 2015 08:00:02 +0300 Subject: [PATCH] NET: nps_enet: TX done race condition We need to set tx_skb pointer before send frame. If we receive interrupt before we set pointer we will try to free SKB with wrong pointer. Now we are sure that SKB pointer will never be NULL during handling TX done and check is removed. Signed-off-by: Noam Camus Signed-off-by: David S. Miller --- drivers/net/ethernet/ezchip/nps_enet.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c index 0e652b4fee8d..8b25f240943d 100644 --- a/drivers/net/ethernet/ezchip/nps_enet.c +++ b/drivers/net/ethernet/ezchip/nps_enet.c @@ -158,11 +158,7 @@ static void nps_enet_tx_handler(struct net_device *ndev) ndev->stats.tx_bytes += tx_ctrl.nt; } - if (priv->tx_skb) { - dev_kfree_skb(priv->tx_skb); - priv->tx_skb = NULL; - } - + dev_kfree_skb(priv->tx_skb); priv->tx_packet_sent = false; if (netif_queue_stopped(ndev)) @@ -528,10 +524,10 @@ static netdev_tx_t nps_enet_start_xmit(struct sk_buff *skb, /* This driver handles one frame at a time */ netif_stop_queue(ndev); - nps_enet_send_frame(ndev, skb); - priv->tx_skb = skb; + nps_enet_send_frame(ndev, skb); + return NETDEV_TX_OK; } -- 2.39.5