netdev - Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter (rmmod BUG)

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Message-Id: <20081114.162105.193724466.davem@davemloft.net>
Date:	Fri, 14 Nov 2008 16:21:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jdb@...x.dk
Cc:	netdev@...r.kernel.org
Subject: Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter
 (rmmod BUG)

From: Jesper Dangaard Brouer <jdb@...x.dk>
Date: Fri, 14 Nov 2008 19:49:22 +0100

> On Fri, 2008-11-14 at 13:38 +0100, Jesper Dangaard Brouer wrote:
> > On Thu, 2008-11-13 at 14:08 -0800, David Miller wrote:
> > > I suspect that something might be changing np->num_ldg, but
> > > anyways the following debugging patch should provide some
> > > clues.  Please reproduce this and send the logs it generates.
> > 
> > Debugging the rmmod problem...
> > 
> > I found a strange behavior, rmmod'ing the niu driver will only cause a
> > kernel BUG, if the driver was loaded at boot time.  If I remove the
> > niu.ko driver from /lib/modules/2.6.28-rc4-davem/kernel/drivers/net/
> > reboot the system.  After that I can load and unload the niu.ko driver
> > without problems... hmmm
> 
> Perhaps this is a regression, as the problem is not in v2.6.27.

This is what I started to suspect as well.

> I'll start bisecting monday...
> 
> I'm not sure its a NIU driver bug, as the number of changes to niu.c is
> very small since v2.6.27. (git log v2.6.27.. drivers/net/niu.c)

Ok, let me know what your bisect finds.
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