cvs commit: src/sys/dev/pccbb pccbb.c
brueffer at FreeBSD.org
Wed Apr 12 21:30:47 UTC 2006
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
> 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.
What kind of debug info can I provide?
Christian Brueffer chris at unixpages.org brueffer at FreeBSD.org
GPG Key: http://people.freebsd.org/~brueffer/brueffer.key.asc
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