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    SubjectRe: PROBLEM: crashing kernels
    On Mon, 27 Nov 2000, Mr. Big wrote:

    > We've disabled the apic, because there was a hint, that maybe there's some
    > bug with the hardware or software on it. I belive that it's could be
    > better to use the apic.
    >
    > The output of lspci -v:
    [...]
    > 00:0e.0 Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100] (rev 08)
    > Subsystem: Intel Corporation 82559 Fast Ethernet LAN on Motherboard
    > Flags: bus master, medium devsel, latency 64, IRQ 5

    Hmm, this is the device you reported you have a problem initially, isn't
    it? If it is, then...

    > 00:12.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01) (prog-if 00 [UHCI])
    > Flags: bus master, medium devsel, latency 64, IRQ 5

    ... it shares its IRQ with an USB host adapter as I suspected. And you
    don't have an USB driver installed. Does the following patch help? (Hmm,
    since you tested 2.4.0-test* as well -- it might not as it's just a
    backport... Then again -- you might hit a different problem with
    2.4.0-test*.)

    It's not impossible for an I/O APIC to lose an EOI message if there are
    severe errors during the transmission -- since you already tried
    2.4.0-test*: have you seen any APIC errors in the syslog?

    Maciej

    --
    + Maciej W. Rozycki, Technical University of Gdansk, Poland +
    +--------------------------------------------------------------+
    + e-mail: macro@ds2.pg.gda.pl, PGP key available +

    diff -up --recursive --new-file linux-2.2.17.macro/drivers/pci/quirks.c linux-2.2.17/drivers/pci/quirks.c
    --- linux-2.2.17.macro/drivers/pci/quirks.c Wed Oct 27 00:53:40 1999
    +++ linux-2.2.17/drivers/pci/quirks.c Fri Oct 20 10:33:01 2000
    @@ -144,6 +144,26 @@ __initfunc(static void quirk_isa_dma_han
    }
    }

    +/*
    + * PIIX3 USB: We have to disable USB interrupts that are
    + * hardwired to PIRQD# and may be shared with an
    + * external device.
    + *
    + * Legacy Support Register (LEGSUP):
    + * bit13: USB PIRQ Enable (USBPIRQDEN),
    + * bit4: Trap/SMI On IRQ Enable (USBSMIEN).
    + *
    + * We mask out all r/wc bits, too.
    + */
    +__initfunc(static void quirk_piix3_usb(struct pci_dev *dev, int arg))
    +{
    + u16 legsup;
    +
    + pci_read_config_word(dev, 0xc0, &legsup);
    + legsup &= 0x50ef;
    + pci_write_config_word(dev, 0xc0, legsup);
    +}
    +

    typedef void (*quirk_handler)(struct pci_dev *, int);

    @@ -202,6 +222,8 @@ static struct quirk_info quirk_list[] __
    */
    { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0, quirk_isa_dma_hangs, 0x00 },
    { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_0, quirk_isa_dma_hangs, 0x00 },
    + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_2, quirk_piix3_usb, 0x00 },
    + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_2, quirk_piix3_usb, 0x00 },
    };

    __initfunc(void pci_quirks_init(void))
    -
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