linux-kernel - Re: [PATCH net-next v3 2/4] net: hdlc_fr: Change the use of "dev" in fr

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Message-ID: <CA+FuTSf_Veb8Pexix5_Nx3Ujm3P+d=0VNx6hhzPsyoBBdwQ=BQ@mail.gmail.com>
Date:   Thu, 29 Oct 2020 12:58:05 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Xie He <xie.he.0141@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Krzysztof Halasa <khc@...waw.pl>
Subject: Re: [PATCH net-next v3 2/4] net: hdlc_fr: Change the use of "dev" in
 fr_rx to make the code cleaner

On Wed, Oct 28, 2020 at 10:12 PM Xie He <xie.he.0141@...il.com> wrote:
>
> The eth_type_trans function is called when we receive frames carrying
> Ethernet frames. This function expects a non-NULL pointer as an argument,
> and assigns it directly to skb->dev.
>
> However, the code handling other types of frames first assigns a pointer
> to "dev", and then at the end checks whether the value is NULL, and if it
> is not NULL, assigns it to skb->dev.
>
> The two flows are different. Mixing them in this function makes the code
> messy. It's better that we convert the second flow to align with how
> eth_type_trans does things.
>
> So this patch changes the code to: first make sure the pointer is not
> NULL, then assign it directly to skb->dev. "dev" is no longer needed until
> the end where we use it to update stats.

No need for dev at all then?