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Date: Wed, 04 Apr 2001 16:00:22 -0700
From: David Brownell <david-b@pacbell.net>
Subject: Re: Contacts within AMD?  AMD-756 USB host-controller blacklisted due
 to
To: "Joachim 'roh' Steiger" <roh@convergence.de>,
        Miles Lane <miles@megapathdsl.net>
Cc: Thomas Dodd <ted@cypress.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
        linux-kernel@vger.kernel.org
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> Apr  4 14:47:15 campari kernel: usb-ohci.c: bogus NDP=204 for OHCI 
> usb-00:07.4
> Apr  4 14:47:15 campari kernel: usb-ohci.c: rereads as NDP=4

Means that your system would have oopsed if it hadn't
tested for the bogus register read (NDP).  That's only one
path; other bogus reads (which could also oops) on other
paths are undetected.  Slightly less-bogus reads on that
particular path may not be detected, and can still oops.

> please correct me if i'm wrong i only don't want to blacklist complete
> chipset-series

Then feel free to develop and submit a better fix.  That'd
be more practical if AMD's workaround were public.  As I
understand it, the bulk of the production chips have this
erratum.  More power to RedHat getting info from AMD.
Meanwhile, this patch improves robustness.

- Dave


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