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Date: Tue, 8 Dec 2020 17:07:58 -0800 From: Xie He <xie.he.0141@...il.com> To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, linux-x25@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Martin Schiller <ms@....tdt.de> Cc: Xie He <xie.he.0141@...il.com> Subject: [PATCH net-next] net: hdlc_x25: Remove unnecessary skb_reset_network_header calls 1. In x25_xmit, skb_reset_network_header is not necessary before we call lapb_data_request. The lapb module doesn't need skb->network_header. So there is no need to set skb->network_header before calling lapb_data_request. 2. In x25_data_indication (called by the lapb module after it has processed the skb), skb_reset_network_header is not necessary before we call netif_rx. After we call netif_rx, the code in net/core/dev.c will call skb_reset_network_header before handing the skb to upper layers (in __netif_receive_skb_core, called by __netif_receive_skb_one_core, called by __netif_receive_skb, called by process_backlog). So we don't need to call skb_reset_network_header by ourselves. Cc: Martin Schiller <ms@....tdt.de> Signed-off-by: Xie He <xie.he.0141@...il.com> --- drivers/net/wan/hdlc_x25.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c index f52b9fed0593..bb164805804e 100644 --- a/drivers/net/wan/hdlc_x25.c +++ b/drivers/net/wan/hdlc_x25.c @@ -77,7 +77,6 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) } skb_push(skb, 1); - skb_reset_network_header(skb); ptr = skb->data; *ptr = X25_IFACE_DATA; @@ -118,7 +117,6 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev) switch (skb->data[0]) { case X25_IFACE_DATA: /* Data to be transmitted */ skb_pull(skb, 1); - skb_reset_network_header(skb); if ((result = lapb_data_request(dev, skb)) != LAPB_OK) dev_kfree_skb(skb); return NETDEV_TX_OK; -- 2.27.0
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