netdev - Re: [PATCH] x25: remove redundant pointer dev

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Message-ID: <CAADfD8wApw_v+uDTijY1K89WRJ_f7tkHmz=6LR086yMjEU4mWQ@mail.gmail.com>
Date:   Mon, 9 May 2022 04:57:40 +0400
From:   Ozgur <ozgurk@...e.org>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Martin Schiller <ms@....tdt.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-x25@...r.kernel.org,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x25: remove redundant pointer dev

On Mon, May 9, 2022 at 1:45 AM Colin Ian King <colin.i.king@...il.com> wrote:
>
> Pointer dev is being assigned a value that is never used, the assignment
> and the variable are redundant and can be removed. Also replace null check
> with the preferred !ptr idiom.
>

Hello,

*dev pointer is device assign global linked list and shouldnt be
touched by the driver so *dev wont get any value right?
Also seems to use this while network interface is initializing because
some activation information and stats information is also kept here,
for example, open *dev will call when ifconfig is called from.

route, link, forward these inital activate and move all values with
net_device *dev?

Regards

> Cleans up clang scan warning:
> net/x25/x25_proc.c:94:26: warning: Although the value stored to 'dev' is
> used in the enclosing expression, the value is never actually read
> from 'dev' [deadcode.DeadStores]
>
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
>  net/x25/x25_proc.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/net/x25/x25_proc.c b/net/x25/x25_proc.c
> index 3bddcbdf2e40..91a2aade3960 100644
> --- a/net/x25/x25_proc.c
> +++ b/net/x25/x25_proc.c
> @@ -79,7 +79,6 @@ static int x25_seq_socket_show(struct seq_file *seq, void *v)
>  {
>         struct sock *s;
>         struct x25_sock *x25;
> -       struct net_device *dev;
>         const char *devname;
>
>         if (v == SEQ_START_TOKEN) {
> @@ -91,7 +90,7 @@ static int x25_seq_socket_show(struct seq_file *seq, void *v)
>         s = sk_entry(v);
>         x25 = x25_sk(s);
>
> -       if (!x25->neighbour || (dev = x25->neighbour->dev) == NULL)
> +       if (!x25->neighbour || !x25->neighbour->dev)
>                 devname = "???";
>         else
>                 devname = x25->neighbour->dev->name;
> --
> 2.35.1
>