4.2.8-ckt10 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Keith Busch <keith.busch@xxxxxxxxx>
commit 1bdb8970392a68489b469c3a330a1adb5ef61beb upstream.
If x86_vector_alloc_irq() fails x86_vector_free_irqs() is invoked to cleanup
the already allocated vectors. This subsequently calls clear_vector_irq().
The failed irq has no vector assigned, which triggers the BUG_ON(!vector) in
clear_vector_irq().
We cannot suppress the call to x86_vector_free_irqs() for the failed
interrupt, because the other data related to this irq must be cleaned up as
well. So calling clear_vector_irq() with vector == 0 is legitimate.
Remove the BUG_ON and return if vector is zero,
[ tglx: Massaged changelog ]
Fixes: b5dc8e6c21e7 "x86/irq: Use hierarchical irqdomain to manage CPU interrupt vectors"
Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
arch/x86/kernel/apic/vector.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 7889bec..c8a2b9c 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -226,7 +226,8 @@ static void clear_irq_vector(int irq, struct apic_chip_data *data)
{
int cpu, vector;
- BUG_ON(!data->cfg.vector);
+ if (!data->cfg.vector)
+ return;
vector = data->cfg.vector;
for_each_cpu_and(cpu, data->domain, cpu_online_mask)
--
2.7.4
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