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    SubjectRe: Early ACPI lockup (was Re: 2.6.20-rc4-mm1)
    Frederik Deweerdt wrote:
    > On Fri, Jan 12, 2007 at 05:53:08PM -0500, Len Brown wrote:
    >> On Friday 12 January 2007 05:20, Frederik Deweerdt wrote:
    >>> On Thu, Jan 11, 2007 at 10:26:27PM -0800, Andrew Morton wrote:
    >>>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc3/2.6.20-rc4-mm1/
    >>>>
    >>> Hi,
    >>>
    >>> The git-acpi.patch replaces earlier "if(!handler) return -EINVAL" by
    >>> "BUG_ON(!handler)". This locks my machine early at boot with a message
    >>> along the lines of (It's hand copied):
    >>> Int 6: cr2: 00000000 eip: c0570e05 flags: 00010046 cs: 60
    >>> stack: c054ffac c011db2b c04936d0 c054ff68 c054ffc0 c054fff4 c057da2c
    >>>
    >>> Reverting the change as follows, allows booting:
    >>> Any ideas to debug this further?
    >>
    >>> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
    >>> index db0c5f6..fba018c 100644
    >>> --- a/drivers/acpi/tables.c
    >>> +++ b/drivers/acpi/tables.c
    >>> @@ -414,7 +414,9 @@ int __init acpi_table_parse(enum acpi_ta
    >>> unsigned int index;
    >>> unsigned int count = 0;
    >>>
    >>> - BUG_ON(!handler);
    >>> + if (!handler)
    >>> + return -EINVAL;
    >>> + /*BUG_ON(!handler);*/
    >>>
    >>> for (i = 0; i < sdt_count; i++) {
    >>> if (sdt_entry[i].id != id)
    >> What do you see if on failure you also print out the params, like below?

    I get this:

    ACPI: RSDP (v000 GBT ) @ 0x000f6e80
    ACPI: RSDT (v001 GBT AWRDACPI 0x42302e31 AWRD 0x01010101) @ 0x3fff3000
    ACPI: FADT (v001 GBT AWRDACPI 0x42302e31 AWRD 0x01010101) @ 0x3fff3040
    ACPI: MADT (v001 GBT AWRDACPI 0x42302e31 AWRD 0x01010101) @ 0x3fff7100
    ACPI: DSDT (v001 GBT AWRDACPI 0x00001000 MSFT 0x0100000c) @ 0x00000000
    ACPI: PM-Timer IO Port: 0x1008
    ACPI: Local APIC address 0xfee00000
    ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
    Processor #0 15:2 APIC version 20
    ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
    Processor #1 15:2 APIC version 20
    ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])
    ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
    ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
    IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
    ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
    ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
    ACPI: IRQ0 used by override.
    ACPI: IRQ2 used by override.
    ACPI: IRQ9 used by override.
    Enabling APIC mode: Flat. Using 1 I/O APICs
    ACPI: acpi_table_parse(17, 00000000) HPET NULL handler!
    Using ACPI (MADT) for SMP configuration information

    reagrds,
    --
    http://www.fi.muni.cz/~xslaby/ Jiri Slaby
    faculty of informatics, masaryk university, brno, cz
    e-mail: jirislaby gmail com, gpg pubkey fingerprint:
    B674 9967 0407 CE62 ACC8 22A0 32CC 55C3 39D4 7A7E
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