From 7dd471f66a5b1eafd301252d1b826ac12ba51c0b Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 4 Oct 2006 02:16:37 -0700
Subject: [PATCH] --- yaml --- r: 38419 b: refs/heads/master c:
 3a16d713626735f3016da0521b7bf251cd78e836 h: refs/heads/master i:   38417:
 e18a1f7bb659964238be458d681e22852f2a87af   38415:
 57d88bbe3220f5dd85edaa7a15e32705eed4d1bb v: v3

---
 [refs]                    |  2 +-
 trunk/include/linux/irq.h |  9 ++++++-
 trunk/kernel/irq/chip.c   | 56 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index f3bcadd390cf..d63688b230a3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 92db6d10bc1bc43330a4c540fa5b64c83d9d865f
+refs/heads/master: 3a16d713626735f3016da0521b7bf251cd78e836
diff --git a/trunk/include/linux/irq.h b/trunk/include/linux/irq.h
index a31a7d8acdb2..82dbb0e8f40b 100644
--- a/trunk/include/linux/irq.h
+++ b/trunk/include/linux/irq.h
@@ -404,8 +404,15 @@ set_irq_chained_handler(unsigned int irq,
 	__set_irq_handler(irq, handle, 1);
 }
 
-/* Set/get chip/data for an IRQ: */
+/* Handle dynamic irq creation and destruction */
+extern int create_irq(void);
+extern void destroy_irq(unsigned int irq);
+
+/* Dynamic irq helper functions */
+extern void dynamic_irq_init(unsigned int irq);
+extern void dynamic_irq_cleanup(unsigned int irq);
 
+/* Set/get chip/data for an IRQ: */
 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 extern int set_irq_data(unsigned int irq, void *data);
 extern int set_irq_chip_data(unsigned int irq, void *data);
diff --git a/trunk/kernel/irq/chip.c b/trunk/kernel/irq/chip.c
index 736cb0bd498f..0dc24386dd99 100644
--- a/trunk/kernel/irq/chip.c
+++ b/trunk/kernel/irq/chip.c
@@ -17,6 +17,62 @@
 
 #include "internals.h"
 
+/**
+ *	dynamic_irq_init - initialize a dynamically allocated irq
+ *	@irq:	irq number to initialize
+ */
+void dynamic_irq_init(unsigned int irq)
+{
+	struct irq_desc *desc;
+	unsigned long flags;
+
+	if (irq >= NR_IRQS) {
+		printk(KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
+		WARN_ON(1);
+		return;
+	}
+
+	/* Ensure we don't have left over values from a previous use of this irq */
+	desc = irq_desc + irq;
+	spin_lock_irqsave(&desc->lock, flags);
+	desc->status = IRQ_DISABLED;
+	desc->chip = &no_irq_chip;
+	desc->handle_irq = handle_bad_irq;
+	desc->depth = 1;
+	desc->handler_data = NULL;
+	desc->chip_data = NULL;
+	desc->action = NULL;
+	desc->irq_count = 0;
+	desc->irqs_unhandled = 0;
+#ifdef CONFIG_SMP
+	desc->affinity = CPU_MASK_ALL;
+#endif
+	spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+/**
+ *	dynamic_irq_cleanup - cleanup a dynamically allocated irq
+ *	@irq:	irq number to initialize
+ */
+void dynamic_irq_cleanup(unsigned int irq)
+{
+	struct irq_desc *desc;
+	unsigned long flags;
+
+	if (irq >= NR_IRQS) {
+		printk(KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
+		WARN_ON(1);
+		return;
+	}
+
+	desc = irq_desc + irq;
+	spin_lock_irqsave(&desc->lock, flags);
+	desc->handle_irq = handle_bad_irq;
+	desc->chip = &no_irq_chip;
+	spin_unlock_irqrestore(&desc->lock, flags);
+}
+
+
 /**
  *	set_irq_chip - set the irq chip for an irq
  *	@irq:	irq number