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-rw-r--r--kernel/irq/chip.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index ad8131473774..b4c1bc7c9ca2 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -426,6 +426,49 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(handle_simple_irq);
+/**
+ * handle_untracked_irq - Simple and software-decoded IRQs.
+ * @desc: the interrupt description structure for this irq
+ *
+ * Untracked interrupts are sent from a demultiplexing interrupt
+ * handler when the demultiplexer does not know which device it its
+ * multiplexed irq domain generated the interrupt. IRQ's handled
+ * through here are not subjected to stats tracking, randomness, or
+ * spurious interrupt detection.
+ *
+ * Note: Like handle_simple_irq, the caller is expected to handle
+ * the ack, clear, mask and unmask issues if necessary.
+ */
+void handle_untracked_irq(struct irq_desc *desc)
+{
+ unsigned int flags = 0;
+
+ raw_spin_lock(&desc->lock);
+
+ if (!irq_may_run(desc))
+ goto out_unlock;
+
+ desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
+
+ if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
+ desc->istate |= IRQS_PENDING;
+ goto out_unlock;
+ }
+
+ desc->istate &= ~IRQS_PENDING;
+ irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
+ raw_spin_unlock(&desc->lock);
+
+ __handle_irq_event_percpu(desc, &flags);
+
+ raw_spin_lock(&desc->lock);
+ irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);
+
+out_unlock:
+ raw_spin_unlock(&desc->lock);
+}
+EXPORT_SYMBOL_GPL(handle_untracked_irq);
+
/*
* Called unconditionally from handle_level_irq() and only for oneshot
* interrupts from handle_fasteoi_irq()