x86, apic: Fix apic=debug boot crash
authorDaniel Kiper <dkiper@net-space.pl>
Thu, 19 Aug 2010 22:46:16 +0000 (00:46 +0200)
committerIngo Molnar <mingo@elte.hu>
Fri, 20 Aug 2010 08:18:28 +0000 (10:18 +0200)
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>
arch/x86/kernel/apic/io_apic.c

index 4dc0084..f1efeba 100644 (file)
@@ -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;