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Message-ID: <20100819224616.GB9967@router-fw-old.local.net-space.pl> Date: Fri, 20 Aug 2010 00:46:16 +0200 From: Daniel Kiper <dkiper@...-space.pl> To: linux-kernel@...r.kernel.org Cc: xen-devel@...ts.xensource.com, konrad.wilk@...cle.com, jeremy@...p.org, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org Subject: [PATCH] arch/x86/kernel/apic/io_apic.c: Fix for crash when apic=debug is used Hi, Here is the patch fixing crash when apic=debug is used and APIC is not properly initialized. This issue appears during Xen Dom0 kernel boot (git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git, xen/stable-2.6.32.x head), however I think that patch is rather generic and should be applied to mainline kernel (it applies to Linux Kernel Ver. 2.6.35 and Ver. 2.6.32.19 with small fuzz). Daniel Signed-off-by: Daniel Kiper <dkiper@...-space.pl> --- arch/x86/kernel/apic/io_apic.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index e41ed24..2b18af1 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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