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Date:      Wed, 12 Apr 2006 23:28:43 +0200
From:      Christian Brueffer <brueffer@FreeBSD.org>
To:        Warner Losh <imp@FreeBSD.org>
Cc:        cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sys/dev/pccbb pccbb.c
Message-ID:  <20060412212843.GH1258@haakonia.hitnet.RWTH-Aachen.DE>
In-Reply-To: <200603300425.k2U4PjJH099559@repoman.freebsd.org>
References:  <200603300425.k2U4PjJH099559@repoman.freebsd.org>

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On Thu, Mar 30, 2006 at 04:25:45AM +0000, Warner Losh wrote:
> imp         2006-03-30 04:25:45 UTC
>=20
>   FreeBSD src repository
>=20
>   Modified files:
>     sys/dev/pccbb        pccbb.c=20
>   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.
>  =20
>   Problem reported by many, but sam@ gave me this workaround after
>   diagnosing the problem.
>  =20

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

--=20
Christian Brueffer	chris@unixpages.org	brueffer@FreeBSD.org
GPG Key:	 http://people.freebsd.org/~brueffer/brueffer.key.asc
GPG Fingerprint: A5C8 2099 19FF AACA F41B  B29B 6C76 178C A0ED 982D

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