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x86, ioapic: Don't warn about non-existing IOAPICs if we have none

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mp_find_ioapic() prints errors like:

    ERROR: Unable to locate IOAPIC for GSI 13

if it can't find the IOAPIC that manages that specific GSI. I
see errors like that at every boot of a laptop that apparently
doesn't have any IOAPICs.

But if there are no IOAPICs it doesn't seem to be an error that
none can be found. A solution that gets rid of this message is
to directly return if nr_ioapics (still) is zero. (But keep
returning -1 in that case, so nothing breaks from this change.)

The call chain that generates this error is:

pnpacpi_allocated_resource()
    case ACPI_RESOURCE_TYPE_IRQ:
        pnpacpi_parse_allocated_irqresource()
            acpi_get_override_irq()
                 mp_find_ioapic()

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Bolle 2011-02-14 22:52:38 +01:00 committed by Ingo Molnar
parent 1c9d16e359
commit 678301ecad
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/apic/io_apic.c
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@ -4002,6 +4002,9 @@ int mp_find_ioapic(u32 gsi)
{
int i = 0;
if (nr_ioapics == 0)
return -1;
/* Find the IOAPIC that manages this GSI. */
for (i = 0; i < nr_ioapics; i++) {
if ((gsi >= mp_gsi_routing[i].gsi_base)