linux-kernel - Re: [PATCH net-2.6.24] remove bogus qeth type check

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Message-ID: <20071011175224.130fb2f7@freepuppy.rosehill>
Date:	Thu, 11 Oct 2007 17:52:24 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mm-commits@...r.kernel.org, heiko.carstens@...ibm.com,
	schwidefsky@...ibm.com
Subject: Re: [PATCH net-2.6.24] remove bogus qeth type check

On Thu, 11 Oct 2007 17:24:54 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Stephen Hemminger <shemminger@...ux-foundation.org>
> Date: Thu, 11 Oct 2007 13:24:58 -0700
> 
> > Not sure why this crept in with hard-header-ops change.
> > Just kill it. Need to start doing cross-compiles for s390...
> > 
> > Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
> > 
> > --- a/drivers/s390/net/qeth_main.c	2007-10-10 08:26:48.000000000 -0700
> > +++ b/drivers/s390/net/qeth_main.c	2007-10-11 13:21:17.000000000 -0700
> > @@ -6581,9 +6581,6 @@ qeth_hard_header_parse(const struct sk_b
> >  	const struct qeth_card *card;
> >  	const struct ethhdr *eth;
> >  
> > -	if (dev->type != ARPHRD_IEEE802_TR)
> > -		return 0;
> > -
> >  	card = qeth_get_card_from_dev(skb->dev);
> >  	if (card->options.layer2)
> >  		goto haveheader;
> 
> Stephen this change is not right.
> 
> In order to preserve the semantics that existed before your
> headerops changes, this test must be there.  From the original
> qeth_main.c code:
> 
> 	if (qeth_get_netdev_flags(card) & IFF_NOARP) {
> 		dev->rebuild_header = NULL;
> 		dev->hard_header = NULL;
> 		dev->header_cache_update = NULL;
> 		dev->hard_header_cache = NULL;
> 	}
>  ...
> 	if (card->options.fake_ll &&
> 		(qeth_get_netdev_flags(card) & IFF_NOARP))
> 			dev->hard_header = qeth_fake_header;
> 	if (dev->type == ARPHRD_IEEE802_TR)
> 		dev->hard_header_parse = NULL;
> 	else
> 		dev->hard_header_parse = qeth_hard_header_parse;
> 
> With the way you set up headerops in the driver, the only way
> to preserve the ARPHRD_IEEE802_TR guard, is to keep the
> test that you added to qeth_hard_header_parse().
> 
> Andrew, please go back to using the first patch you wrote to
> fix the build, alternative resync with net-2.6.git as that
> version of the build fix is there too.

Dave, you right, that is why I put that test in. Should have kept
the staging tree and notes around longer.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
-
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