From 236550e70368f7fb5f854d5a59aa16e13f169a06 Mon Sep 17 00:00:00 2001 From: Daniel Kiper Date: Fri, 20 Aug 2010 00:46:16 +0200 Subject: x86, apic: Fix apic=debug boot crash 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 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 Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/io_apic.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index e41ed24ab26d..2b18af15b3dd 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -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; -- cgit v1.2.3