Re: 2.6.13: Crash in Yenta initialization

[Andreas Koch <koch@esa.informatik.tu-darmstadt.de>]

On Tue, Sep 13, 2005 at 02:36:04PM +0200, Andreas Koch wrote:
> Igor,

^^^^^^^ That should be Ivan, sorry for the mix-up (I just had a long
phone call with an Igor).

Andreas

> 
> I just had a chance to do some more testing, and the crash even occurs
> in 2.6.13-rc2.  I haven't had a chance to get serial console logs yet,
> but I assume they will turn out similarly to the ones captured on
> 2.6.13 (glancing at the text as it scrolled by).  So, something must
> have changed between 2.6.12-rc6+patches and 2.6.13-rc2 (including the
> patches).
> 
> Is there anything specific you want me to look for?
> 
> Andreas
> 
> 
> On Sat, Sep 03, 2005 at 10:34:01PM +0400, Ivan Kokshaysky wrote:
> > On Sat, Sep 03, 2005 at 02:45:08AM +0200, Andreas Koch wrote:
> > > crucial part seem to be the different bridge initialization sections:
> > 
> > Indeed.
> > 
> > > 2.6.12-rc6 + Ivan's patches:
> > ...
> > >           PCI: Bus 7, cardbus bridge: 0000:06:09.0
> > >             IO window: 00006000-00006fff
> > >             IO window: 00007000-00007fff
> > >             PREFETCH window: 82000000-83ffffff
> > >             MEM window: 8c000000-8dffffff
> > >           PCI: Bus 11, cardbus bridge: 0000:06:09.1
> > >             IO window: 00008000-00008fff
> > >             IO window: 00009000-00009fff
> > >             PREFETCH window: 84000000-85ffffff
> > >             MEM window: 8e000000-8fffffff
> > >           PCI: Bus 15, cardbus bridge: 0000:06:09.3
> > ...
> > > ... Versus the much shorter output from 2.6.13
> > ...
> > >           PCI: Bus 7, cardbus bridge: 0000:06:09.0
> > >             IO window: 00004000-000040ff
> > >             IO window: 00004400-000044ff
> > >             PREFETCH window: 82000000-83ffffff
> > >             MEM window: 88000000-89ffffff
> > >           PCI: Bridge: 0000:00:1e.0
> > 
> > It's mysterious.
> > So 2.6.13 doesn't see cardbus bridge functions 06:09.1 and 06:09.3,
> > which means that these devices are not on the per-bus device list.
> > OTOH, they are still visible on the global device list, since yenta
> > driver found them. No surprise that it crashes with some uninitialized
> > pointer.
> > 
> > I'd suspect some change in PCI probing code between 2.6.12-rc6 and
> > 2.6.13, but so far I'm unable to find what it was...
> > 
> > Maybe you could try 2.6.12 release and 2.6.13-rc kernels to see where
> > it breaks?
> > (Note that the PCI setup patches that you're using went into 2.6.13-rc2.)
> > 
> > Ivan.

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