From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Lunn <andrew@lunn.ch>
Subject: Re: [PATCH net-next 4/7] net: dsa: free orig skb on rcv if
 reallocated
Date: Tue, 30 May 2017 18:26:32 +0200
Message-ID: <20170530162632.GN22758@lunn.ch>
References: <20170530142131.23568-1-vivien.didelot@savoirfairelinux.com>
 <20170530142131.23568-5-vivien.didelot@savoirfairelinux.com>
 <20170530152505.GG22758@lunn.ch>
 <8737bm4aio.fsf@weeman.i-did-not-set--mail-host-address--so-tickle-me>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        kernel@savoirfairelinux.com,
        "David S. Miller" <davem@davemloft.net>,
        Florian Fainelli <f.fainelli@gmail.com>
To: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <8737bm4aio.fsf@weeman.i-did-not-set--mail-host-address--so-tickle-me>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

On Tue, May 30, 2017 at 11:41:51AM -0400, Vivien Didelot wrote:
> Hi Andrew,
> 
> Andrew Lunn <andrew@lunn.ch> writes:
> 
> > On Tue, May 30, 2017 at 10:21:28AM -0400, Vivien Didelot wrote:
> >> If the receive function of a tagger reallocated the SKB, the original
> >> SKB is currently not freed. Fix this and free it on both copy or error.
> >
> > I don't see any of the receive functions reallocate the skb. It might
> > be better to just simplify the code to take away the option to return
> > a different skb.
> 
> I think it was written such way to be symmetrical with the xmit
> implementation, where the trailer tagger does reallocate the skb.

trailer_xmit() releases the original and so does the in-review KSZ
tagger.

So i think in general, Rx and Rx, the tagger should be responsible for
freeing the original, but on error the core should do the free.

	Andrew