Re: [Em28xx] dvb-core random crashes

On Tuesday 10 July 2007, Alan Stern wrote:
> On Tue, 10 Jul 2007, Christoph wrote:

> > > For whatever it's worth, the crash occurred in end_async_unlink because
> > > ehci->reclaim was NULL.  This may imply that ehci->reclaim_ready was
> > > set when it shouldn't be.  Don't ask me how either of these could
> > > have happened.
> > > 
> > > Alan Stern
> > > 
> > 
> > mh, how about this:
> > drivers/usb/host/ehci-hcd.c:640
> > 
> >     /* complete the unlinking of some qh [4.15.2.3] */
> >     if (status & STS_IAA) {
> >         COUNT (ehci->stats.reclaim);
> >         ehci->reclaim_ready = 1;
> >         bh = 1;
> >     }
> > ...
> >     if (bh)
> >         ehci_work (ehci);
> > 
> > bh was set to 1 ... possible there?!
> 
> It is possible; I don't know enough about how the driver works to say
> for sure.  You could test it easily enough.  Just add a printk there if
> ehci->reclaim is NULL.

Makes sense to me.  That whole timer thing is a bit dodgey
anyway ... combining the IAA watchdog (without which VIA parts
lose horribly) with the other mechanisms has always seemed to
me like it would hold some bugs.

- Dave


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