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

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Message-Id: <1226688562.12092.8.camel@localhost.localdomain>
Date:	Fri, 14 Nov 2008 19:49:22 +0100
From:	Jesper Dangaard Brouer <jdb@...x.dk>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter
	(rmmod BUG)

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.

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)

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network developer
  Cand. Scient Datalog / MSc.
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer
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