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()