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-rw-r--r--kernel/irq/chip.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 736cb0bd498..0dc24386dd9 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -18,6 +18,62 @@
#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
* @chip: pointer to irq chip description structure