2 files changed, 42 insertions, 0 deletions

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 01fc7f79d74a..5a360dd4331b 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -24,6 +24,7 @@
 void fastcall
 handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
 {
+        print_irq_desc(irq, desc);
         kstat_this_cpu.irqs[irq]++;
         ack_bad_irq(irq);
 }
@@ -61,6 +62,7 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned = {
  */
 static void ack_bad(unsigned int irq)
 {
+        print_irq_desc(irq, irq_desc + irq);
         ack_bad_irq(irq);
 }
 
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 2ba8ae3c8e96..08a849a22447 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -22,3 +22,43 @@ static inline void unregister_handler_proc(unsigned int irq,
                                            struct irqaction *action) { }
 #endif
 
+/*
+ * Debugging printout:
+ */
+
+#include <linux/kallsyms.h>
+
+#define P(f) if (desc->status & f) printk("%14s set\n", #f)
+
+static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
+{
+        printk("irq %d, desc: %p, depth: %d, count: %d, unhandled: %d\n",
+                irq, desc, desc->depth, desc->irq_count, desc->irqs_unhandled);
+        printk("->handle_irq():  %p, ", desc->handle_irq);
+        print_symbol("%s\n", (unsigned long)desc->handle_irq);
+        printk("->chip(): %p, ", desc->chip);
+        print_symbol("%s\n", (unsigned long)desc->chip);
+        printk("->action(): %p\n", desc->action);
+        if (desc->action) {
+                printk("->action->handler(): %p, ", desc->action->handler);
+                print_symbol("%s\n", (unsigned long)desc->action->handler);
+        }
+
+        P(IRQ_INPROGRESS);
+        P(IRQ_DISABLED);
+        P(IRQ_PENDING);
+        P(IRQ_REPLAY);
+        P(IRQ_AUTODETECT);
+        P(IRQ_WAITING);
+        P(IRQ_LEVEL);
+        P(IRQ_MASKED);
+#ifdef CONFIG_IRQ_PER_CPU
+        P(IRQ_PER_CPU);
+#endif
+        P(IRQ_NOPROBE);
+        P(IRQ_NOREQUEST);
+        P(IRQ_NOAUTOEN);
+}
+
+#undef P
+