linux-kernel - Re: [PATCH net] net: dsa: tag_rtl4

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Date:   Mon, 1 Mar 2021 16:01:42 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: dsa: tag_rtl4_a: fix egress tags

On Mon, Mar 01, 2021 at 02:58:59PM +0100, Linus Walleij wrote:
> On Sun, Feb 28, 2021 at 6:08 PM DENG Qingfang <dqfext@...il.com> wrote:
> 
> > Commit 86dd9868b878 has several issues, but was accepted too soon
> > before anyone could take a look.
> >
> > - Double free. dsa_slave_xmit() will free the skb if the xmit function
> >   returns NULL, but the skb is already freed by eth_skb_pad(). Use
> >   __skb_put_padto() to avoid that.
> > - Unnecessary allocation. It has been done by DSA core since commit
> >   a3b0b6479700.
> > - A u16 pointer points to skb data. It should be __be16 for network
> >   byte order.
> > - Typo in comments. "numer" -> "number".
> >
> > Fixes: 86dd9868b878 ("net: dsa: tag_rtl4_a: Support also egress tags")
> > Signed-off-by: DENG Qingfang <dqfext@...il.com>
> 
> Ooops I send patches before properly going through the mailbox.
> Oh well things like that happen.
> 
> David: ignore my patches to the same tagger and apply this instead!
> 
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> 
> Yours,
> Linus Walleij

Last time I checked, performance/timing sensitive code is impacted by
netdev_dbg calls even if dynamic debugging isn't turned on. However,
neither your patches nor Qingfang's have removed that netdev_dbg line.
Is there any good reason to keep it?