diff options
| -rw-r--r-- | include/linux/irq.h | 1 | ||||
| -rw-r--r-- | kernel/irq/spurious.c | 12 |
2 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 1695054e8c63..44657197fcb0 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -161,6 +161,7 @@ struct irq_desc { unsigned int wake_depth; /* nested wake enables */ unsigned int irq_count; /* For detecting broken IRQs */ unsigned int irqs_unhandled; + unsigned long last_unhandled; /* Aging timer for unhandled count */ spinlock_t lock; #ifdef CONFIG_SMP cpumask_t affinity; diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index bd9e272d55e9..32b161972fad 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -172,7 +172,17 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret) { if (unlikely(action_ret != IRQ_HANDLED)) { - desc->irqs_unhandled++; + /* + * If we are seeing only the odd spurious IRQ caused by + * bus asynchronicity then don't eventually trigger an error, + * otherwise the couter becomes a doomsday timer for otherwise + * working systems + */ + if (jiffies - desc->last_unhandled > HZ/10) + desc->irqs_unhandled = 1; + else + desc->irqs_unhandled++; + desc->last_unhandled = jiffies; if (unlikely(action_ret != IRQ_NONE)) report_bad_irq(irq, desc, action_ret); } |