linux-kernel - Re: s390x: getting ipv6 bugs on mainline since 2.6.23-git3

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Date:	Thu, 18 Oct 2007 12:37:44 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Andy Whitcroft <apw@...dowen.org>, linux390@...ibm.com,
	linux-s390@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Subject: Re: s390x: getting ipv6 bugs on mainline since 2.6.23-git3


On Thu, 2007-10-18 at 11:43 +0200, Patrick McHardy wrote:
> Andy Whitcroft wrote:
> > Seems we are getting some kind of bug out of our s390x partition (lnxabat1)
> > when booting latest mainline releases, specifically since 2.6.23-git3.
> > 
> > Kernel BUG at 0000000000000002 Ýverbose debug info unavailable?
> > illegal operation: 0001 Ý#1?
> Which network driver are you using? Please post the output of
> "ip link list <dev>".

This is a bug in the qeth driver. It has been introduced by this commit:

commit 3b04ddde02cf1b6f14f2697da5c20eca5715017f
Author: Stephen Hemminger <shemminger@...ux-foundation.org>
Date:   Tue Oct 9 01:40:57 2007 -0700

    [NET]: Move hardware header operations out of netdevice.

    Since hardware header operations are part of the protocol class
    not the device instance, make them into a separate object and
    save memory.

    Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
    Signed-off-by: David S. Miller <davem@...emloft.net>

I've hacked up a fix for it. The real fix will be done by our networking
people.

-- 
blue skies,
  Martin.

"Reality continues to ruin my life." - Calvin.

---

 drivers/s390/net/qeth_main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -urpN linux-2.6/drivers/s390/net/qeth_main.c linux-2.6-patched/drivers/s390/net/qeth_main.c
--- linux-2.6/drivers/s390/net/qeth_main.c	2007-10-17 15:05:36.000000000 +0200
+++ linux-2.6-patched/drivers/s390/net/qeth_main.c	2007-10-17 15:05:46.000000000 +0200
@@ -6643,7 +6643,8 @@ qeth_netdev_init(struct net_device *dev)
 	dev->vlan_rx_kill_vid = qeth_vlan_rx_kill_vid;
 	dev->vlan_rx_add_vid = qeth_vlan_rx_add_vid;
 #endif
-	dev->header_ops = &qeth_null_ops;
+	if (qeth_get_netdev_flags(card) & IFF_NOARP)
+		dev->header_ops = &qeth_null_ops;
 
 #ifdef CONFIG_QETH_IPV6
 	/*IPv6 address autoconfiguration stuff*/


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