linux-kernel - Re: netfront for review

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Message-ID: <4639F16C.3090005@goop.org>
Date:	Thu, 03 May 2007 07:27:56 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Gerd Hoffmann <kraxel@...hat.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>
Subject: Re: netfront for review

Gerd Hoffmann wrote:
>> Gerd, in change 11196:b85da7cd9ea5 "front: Fix rx buffer leak when
>> tearing down an interface." you added a call to
>> "add_id_to_freelist(np->rx_skbs, id);".  However, rx_skbs doesn't have
>> an extra entry for the list head, and there's never any corresponding
>> get_id_from_freelist(np->rx_skbs).  What should it be?
>
> The function has an effect in page flipping mode only.  It walks the
> whole list of rx skbufs (id is the loop variable ...), checks whenever
> they are handed out to the frontend driver to fill in packet data and
> not returned yet, and if so reclaim them ...

Yes, but why use add_id_to_freelist?  rx_skbs are not being used on a
freelist anywhere else.  It just means the rx_skb array gets filled with
small integers, but the rest of the code assumes they're either NULL or
an skb pointer.

    J
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