Re: 2.6.25-rc5: Reported regressions from 2.6.24

[Stefan Richter]

Thomas Meyer wrote:
> Adrian Bunk schrieb:
> > On Tue, Mar 11, 2008 at 01:22:42PM +0100, Stefan Richter wrote:
> >  
> > > Rafael J. Wysocki wrote:
> > >    
> > > > Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=10080

I have reopened, re-assigned, and slightly renamed that bug now.

> > > > Subject        : 2.6.25-rc2: ohci1394 problem
> > > > Submitter    : Thomas Meyer <thomas@xxxxxxxx>
> > > > Date        : 2008-02-20 08:47
> > > > References    : http://lkml.org/lkml/2008/2/20/58
> > > > Handled-By    : Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>

This bug is not handled by me.

> > > >       
> > > Thomas wrote on 2008-02-25:
> > > ''So i did a "make clean" and a "make" (not a make
> > > -j3 as i use to do) and recompiled 2.6.25-rc3 and now it works again.
> > > Case closed under strange error.''
> > > ...
> > >     
> >
> > Although I don't think this would cause the error, it would be nice if 
> > Thomas could verify that the -j3 did not cause the problem.
> >   
> I still cannot *believe* this bug, but  i just checked out the latest 
> kernel and did a make distclean and a make (with mr. bunks patch 
> applied) and there it is again:
> $ dmesg
>
> (cut)
> [  464.852986] ohci1394: fw-host0: physical posted write error
[...]
> [  464.898957] ohci1394: fw-host0: Unhandled interrupt(s) 0xfc7cfe0c
> and so on....
>
> $ git describe
> v2.6.25-rc6-14-gbde4f8f
>
> As i already wrote: I tried to bisect this behavior, but with no result.
>
> And Stefan didn't change anything in the involved drivers. I have no 
> idea what could cause this kind of bug!

The messages which Thomas posted result from ohci1394 getting ~0 (i.e. 
0xffffffff) from some or all MMIO reads.  This is not a FireWire driver bug.

MMIO has been broken by something after 2.6.24.
--
Stefan Richter
-=====-==--- --== =--==
http://arcgraph.de/sr/
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