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| author |   Prarit Bhargava <prarit@redhat.com> | 2010-04-27 11:24:42 -0400 |
|---|---|---|
| committer |   H. Peter Anvin <hpa@zytor.com> | 2010-04-30 14:31:38 -0700 |
| commit | bbd391a15d82e14efe9d69ba64cadb855b061dba (patch) | |
| tree | fa390e76f76519efd389538f9a12027aaefd7f4d /arch/x86/kernel/apic/io_apic.c | |
| parent | x86: Fix 'reservetop=' functionality (diff) | |
| download | linux-dev-bbd391a15d82e14efe9d69ba64cadb855b061dba.tar.xz linux-dev-bbd391a15d82e14efe9d69ba64cadb855b061dba.zip | |
x86: Fix NULL pointer access in irq_force_complete_move() for Xen guests
Upstream PV guests fail to boot because of a NULL pointer in
irq_force_complete_move(). It is possible that xen guests have
irq_desc->chip_data = NULL.
Test for NULL chip_data pointer before attempting to complete an irq move.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
LKML-Reference: <20100427152434.16193.49104.sendpatchset@prarit.bos.redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@kernel.org> [2.6.33]
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/apic/io_apic.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 127b8718abfb..eb2789c3f721 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2545,6 +2545,9 @@ void irq_force_complete_move(int irq) struct irq_desc *desc = irq_to_desc(irq); struct irq_cfg *cfg = desc->chip_data; + if (!cfg) + return; + __irq_complete_move(&desc, cfg->vector); } #else |