netdev - Re: 3c59x: shared interrupt problem

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Date:	Tue, 17 Mar 2009 10:37:55 +0100
From:	"Gerhard Pircher" <gerhard_pircher@....net>
To:	Steffen Klassert <klassert@...hematik.tu-chemnitz.de>,
	davem@...emloft.net
Cc:	netdev@...r.kernel.org, shemminger@...tta.com,
	akpm@...ux-foundation.org
Subject: Re: 3c59x: shared interrupt problem


-------- Original-Nachricht --------
> Datum: Sat, 14 Mar 2009 15:08:41 +0100
> Von: Steffen Klassert <klassert@...hematik.tu-chemnitz.de>
> An: David Miller <davem@...emloft.net>
> CC: akpm@...ux-foundation.org, shemminger@...tta.com, gerhard_pircher@....net, netdev@...r.kernel.org
> Betreff: Re: 3c59x: shared interrupt problem

> On Fri, Mar 13, 2009 at 03:51:16PM -0700, David Miller wrote:
> > > #### ChangeSet ####
> > > 2003-05-19 10:27:49-07:00, akpm@...eo.com 
> > >   [PATCH] 3c59x irqreturn fix
> > >   
> > >   Apparently boomerang_interrupt() is generating lots of "nobody
> > >   cared" warnings - one per packet it seems.  Frankly, I don't have
> > >   a clue why.
> > >   
> > >   These are ancient cards and the driver is otherwise stable, so
> > >   just change it to return IRQ_HANDLED and move on...
> > 
> > So basically it's a band-aid because we didn't investigate why
> > this happens.
> > 
> > I think we should put the change in, and then look into things
> > properly if users report this issue again.
> > 
> 
> Gerhard reported at least one of these "nobody cared" messages at
> shutdown after applying this change. He wanted to provide us with
> further informations about this issue next week. Best would be to put
> it in together with a fix.
> So I would suggest to wait, perhaps we can fix it with his
> informations.
Okay, here's a small status update in order to show that I'm really
doing something. :)
Increasing the value of vortex_debug doesn't really help. It slows
down the network transfer too much to trigger the bug. Does somebody
know where to insert some printks in the driver to get a useful debug
output?
Bisecting shows that even v2.6.26-rc1 fails. But I have a v2.6.27-rc7
image that works fine!? Looks like I have to put more effort in
bisecting.

Gerhard
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