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| author | Yinghai Lu <yinghai@kernel.org> | 2010-10-30 01:19:29 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2010-10-30 10:28:31 +0200 |
| commit | 7b79462a20826a7269322113c68ca78d5f67c0bd (patch) | |
| tree | ae873a15bd5fbf47c2d75e26ebe84767ab1c94be | |
| parent | 2d10d8737ccdba752d60106abbc6ed4f37404923 (diff) | |
| download | linux-stable-7b79462a20826a7269322113c68ca78d5f67c0bd.tar.gz linux-stable-7b79462a20826a7269322113c68ca78d5f67c0bd.tar.bz2 linux-stable-7b79462a20826a7269322113c68ca78d5f67c0bd.zip | |
x86: Check irq_remapped instead of remapping_enabled in destroy_irq()
Russ Anderson reported:
| There is a regression that is causing a NULL pointer dereference
| in free_irte when shutting down xpc. git bisect narrowed it down
| to git commit d585d06(intr_remap: Simplify the code further), which
| changed free_irte(). Reverse applying the patch fixes the problem.
We need to use irq_remapped() for each irq instead of checking only
intr_remapping_enabled as there might be non remapped irqs even when
remapping is enabled.
[ tglx: use cfg instead of retrieving it again. Massaged changelog ]
Reported-bisected-and-tested-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <4CCBD511.40607@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/apic/io_apic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 0929191d83cf..7cc0a721f628 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -3109,7 +3109,7 @@ void destroy_irq(unsigned int irq) irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE); - if (intr_remapping_enabled) + if (irq_remapped(cfg)) free_irte(irq); raw_spin_lock_irqsave(&vector_lock, flags); __clear_irq_vector(irq, cfg); |