Date: Sun, 28 Sep 2003 19:48:00 +0300
From: Pekka Pietikainen <pp@ee.oulu.fi>
To: Jan De Luyck <lkml@kcore.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4, b44 transmit timeout
Message-ID: <20030928164759.GA12560@ee.oulu.fi>
References: <200309081134.17013.lkml@kcore.org>
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On Mon, Sep 08, 2003 at 11:34:17AM +0200, Jan De Luyck wrote:
> On Tue, Sep 02, 2003 at 09:33:53AM +0200, Norbert Preining wrote:  
> 
> > A-ha! Thanks, I think this should be enough to figure out what the problem  
> > is... Looks like the driver doesn't even get the packets pump tries to send,  
> > pump is a bit special in the way it bounces the interface up and down when  
> > doing its work, that probably triggers a race in b44..
> 
> I can also easily recreate this by calling dhcpcd e.g. when the cable isn't in 
> the socket yet. If i attach the cable then I see the interface coming up, 
> going down, and then the NETDEV watchdog message.
> Unfortunatly this usually means that dhcpcd goes hanging. ifconfig hangs too 
> if I try to use it, and rebooting must be forced with sysrq and an oops a 
> alt-sysrq-o for poweroff...
This could help (tm) :-)

--- b44.c.orig  2003-09-28 19:36:48.000000000 +0300
+++ b44.c       2003-09-28 19:37:07.000000000 +0300
@@ -870,6 +870,7 @@

        spin_unlock_irq(&bp->lock);

+       b44_enable_ints(bp);
        netif_wake_queue(dev);
 }

at least I could do some pretty dirty things to the poor chip and it still
seems to recover after this patch.

rmmod still has some problems, occasionally I get a "usage count 2" thing
(currently running the rawhide 2.4.22-1.2061.nptl, I've seen similar with
2.6.0-test5ish too, I suspect ipv6 might be involved, but sometimes I can rmmod
it even with ipv6 loaded so it's a bit random).
-
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