Re: 2.6.14-rc4: dma_timer_expiry [was 2.6.13-rc2 hangs at boot]

[Andrew Morton <akpm@osdl.org>]

Tero Roponen <teanropo@cc.jyu.fi> wrote:
>
> On Fri, 29 Jul 2005, Andrew Morton wrote:
> 
> > Tero Roponen <teanropo@cc.jyu.fi> wrote:
> > >
> > > Hi,
> > >
> > > I just tested 2.6.13-rc4. At boot it prints:
> > > "dma_timer_expiry: dma status == 0x61" many times.
> > > That's the same problem as in 2.6.13-rc2.
> > >
> > > If I apply the following patch, everything seems to be fine.
> > > I'm not sure if this is the right thing to do, but it works for me.
> > >
> > > -
> > > Tero Roponen
> > >
> > >
> > > --- 2.6.13-rc2/drivers/pci/setup-bus.c	Thu Jul  7 01:32:43 2005
> > > +++ linux/drivers/pci/setup-bus.c	Fri Jul  8 10:25:20 2005
> > > @@ -40,8 +40,8 @@
> > >   * FIXME: IO should be max 256 bytes.  However, since we may
> > >   * have a P2P bridge below a cardbus bridge, we need 4K.
> > >   */
> > > -#define CARDBUS_IO_SIZE		(4096)
> > > -#define CARDBUS_MEM_SIZE	(32*1024*1024)
> > > +#define CARDBUS_IO_SIZE		(256)
> > > +#define CARDBUS_MEM_SIZE	(32*1024*1024)
> > >
> >
> > hm, how did you come up with that fix?  Those numbers have been like that
> > since forever.
> >
> > What's the latest 2.6 kernel which worked OK?
> >
> > Would it be possible for you to generate the `dmesg -s 100000' output for
> > both good and bad kernels, see what the differences are?
> >
> > Thanks.
> 
> Hi,
> 
> that patch was from Ivan Kokshaysky (http://lkml.org/lkml/2005/7/8/25)

OK.

> My original report is here: http://lkml.org/lkml/2005/7/6/174

I see.  Ivan, do we know what's going on here?