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x86, apic: Fix apic=debug boot crash

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Fix a boot crash when apic=debug is used and the APIC is
not properly initialized.

This issue appears during Xen Dom0 kernel boot but the
fix is generic and the crash could occur on real hardware
as well.

Signed-off-by: Daniel Kiper <dkiper@net-space.pl>
Cc: xen-devel@lists.xensource.com
Cc: konrad.wilk@oracle.com
Cc: jeremy@goop.org
Cc: <stable@kernel.org> # .35.x, .34.x, .33.x, .32.x
LKML-Reference: <20100819224616.GB9967@router-fw-old.local.net-space.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Daniel Kiper 2010-08-20 00:46:16 +02:00 committed by Ingo Molnar
parent d7c53c9e82
commit 05e407603e
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kernel/apic/io_apic.c
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@ -1728,6 +1728,8 @@ __apicdebuginit(void) print_IO_APIC(void)
struct irq_pin_list *entry;
cfg = desc->chip_data;
if (!cfg)
continue;
entry = cfg->irq_2_pin;
if (!entry)
continue;