---

yaml
---
r: 31075
b: refs/heads/master
c: dae8620
h: refs/heads/master
i:
  31073: 80daff2
  31071: a0e6c8f
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6a6de9ef5850d063c3d3fb50784bfe3a6d0712c6
+refs/heads/master: dae8620421833bb2e9a01c4ccc42bdc3759b81df

trunk/arch/i386/kernel/irq.c

@@ -82,6 +82,10 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs)
 	}
 #endif
 
+	if (!irq_desc[irq].handle_irq) {
+		__do_IRQ(irq, regs);
+		goto out_exit;
+	}
 #ifdef CONFIG_4KSTACKS
 
 	curctx = (union irq_ctx *) current_thread_info();
@@ -121,6 +125,7 @@ fastcall unsigned int do_IRQ(struct pt_regs *regs)
 #endif
 		__do_IRQ(irq, regs);
 
+out_exit:
 	irq_exit();
 
 	return 1;

trunk/include/linux/irq.h

@@ -176,17 +176,6 @@ typedef struct irq_desc		irq_desc_t;
  */
 #include <asm/hw_irq.h>
 
-/*
- * Architectures call this to let the generic IRQ layer
- * handle an interrupt:
- */
-static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
-{
-	struct irq_desc *desc = irq_desc + irq;
-
-	desc->handle_irq(irq, desc, regs);
-}
-
 extern int setup_irq(unsigned int irq, struct irqaction *new);
 
 #ifdef CONFIG_GENERIC_HARDIRQS
@@ -324,6 +313,22 @@ handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *,
  */
 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs);
 
+/*
+ * Architectures call this to let the generic IRQ layer
+ * handle an interrupt. If the descriptor is attached to an
+ * irqchip-style controller then we call the ->handle_irq() handler,
+ * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
+ */
+static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs)
+{
+	struct irq_desc *desc = irq_desc + irq;
+
+	if (likely(desc->handle_irq))
+		desc->handle_irq(irq, desc, regs);
+	else
+		__do_IRQ(irq, regs);
+}
+
 /* Handling of unhandled and spurious interrupts: */
 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 			   int action_ret, struct pt_regs *regs);