| From 05e407603e527f9d808dd3866d3a17c2ce4dfcc5 Mon Sep 17 00:00:00 2001 |
| From: Daniel Kiper <dkiper@net-space.pl> |
| Date: Fri, 20 Aug 2010 00:46:16 +0200 |
| Subject: x86, apic: Fix apic=debug boot crash |
| |
| From: Daniel Kiper <dkiper@net-space.pl> |
| |
| commit 05e407603e527f9d808dd3866d3a17c2ce4dfcc5 upstream. |
| |
| 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 |
| LKML-Reference: <20100819224616.GB9967@router-fw-old.local.net-space.pl> |
| Signed-off-by: Ingo Molnar <mingo@elte.hu> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
| |
| --- |
| arch/x86/kernel/apic/io_apic.c | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| --- a/arch/x86/kernel/apic/io_apic.c |
| +++ b/arch/x86/kernel/apic/io_apic.c |
| @@ -1732,6 +1732,8 @@ __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; |
