cvs commit: src/sys/dev/pccbb pccbb.c

[Christian Brueffer]

On Wed, Apr 12, 2006 at 11:28:43PM +0200, Christian Brueffer wrote:
> On Thu, Mar 30, 2006 at 04:25:45AM +0000, Warner Losh wrote:
> > imp         2006-03-30 04:25:45 UTC
> > 
> >   FreeBSD src repository
> > 
> >   Modified files:
> >     sys/dev/pccbb        pccbb.c 
> >   Log:
> >   On some laptops, under very high loads, the socket event register read
> >   in the ISR doesn't read the actual socket event register, but instead
> >   reads garbage (usually 0xffffffff, but other times other things).
> >   This totally violates the PCI spec, but happens rarely enough that a
> >   workaround is in order.  This adds one test when we have a real
> >   interrupt to service (which is very rare), and doesn't affect the
> >   usualy 'nothing to see here' case at all.
> >   
> >   Problem reported by many, but sam@ gave me this workaround after
> >   diagnosing the problem.
> >   
> 
> This breaks pccard/cardbus support on my Thinkpad T41p (confirmed by
> backing this change out).  With this change, I just get an "Interrupt
> storm detected on irq 5; throttling" message.
> 

To clarify this, I get the interrupt storm message when I plug any
of my pccard/cardbus cards in.

- Christian

-- 
Christian Brueffer	chris at unixpages.org	brueffer at FreeBSD.org
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