netdev - Re: [PATCH net-next v2] net: hdlc_x25: Remove unnecessary skb_reset_network

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Date:   Wed, 09 Dec 2020 19:23:51 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     xie.he.0141@...il.com
Cc:     kuba@...nel.org, linux-x25@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ms@....tdt.de
Subject: Re: [PATCH net-next v2] net: hdlc_x25: Remove unnecessary
 skb_reset_network_header calls

From: Xie He <xie.he.0141@...il.com>
Date: Tue,  8 Dec 2020 17:40:13 -0800

> 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 some data
> have been received), 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>

Applied, thanks.