3 files changed, 14 insertions, 3 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2d0dc3efe813..ebfd24a41858 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -233,6 +233,8 @@ void irq_chip_set_defaults(struct irq_chip *chip)
                 chip->shutdown = chip->disable;
         if (!chip->name)
                 chip->name = chip->typename;
+        if (!chip->end)
+                chip->end = dummy_irq_chip.end;
 }
 
 static inline void mask_ack_irq(struct irq_desc *desc, int irq)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 6879202afe9a..b385878c6e80 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -216,6 +216,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 {
         struct irq_desc *desc = irq_desc + irq;
         struct irqaction *old, **p;
+        const char *old_name = NULL;
         unsigned long flags;
         int shared = 0;
 
@@ -255,8 +256,10 @@ int setup_irq(unsigned int irq, struct irqaction *new)
                  * set the trigger type must match.
                  */
                 if (!((old->flags & new->flags) & IRQF_SHARED) ||
-                    ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK))
+                    ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK)) {
+                        old_name = old->name;
                         goto mismatch;
+                }
 
 #if defined(CONFIG_IRQ_PER_CPU)
                 /* All handlers must agree on per-cpuness */
@@ -322,11 +325,13 @@ int setup_irq(unsigned int irq, struct irqaction *new)
         return 0;
 
 mismatch:
-        spin_unlock_irqrestore(&desc->lock, flags);
         if (!(new->flags & IRQF_PROBE_SHARED)) {
                 printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq);
+                if (old_name)
+                        printk(KERN_ERR "current handler: %s\n", old_name);
                 dump_stack();
         }
+        spin_unlock_irqrestore(&desc->lock, flags);
         return -EBUSY;
 }
 
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 543ea2e5ad93..9c7e2e4c1fe7 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -147,7 +147,11 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
         if (unlikely(irqfixup)) {
                 /* Don't punish working computers */
                 if ((irqfixup == 2 && irq == 0) || action_ret == IRQ_NONE) {
-                        int ok = misrouted_irq(irq);
+                        int ok;
+
+                        spin_unlock(&desc->lock);
+                        ok = misrouted_irq(irq);
+                        spin_lock(&desc->lock);
                         if (action_ret == IRQ_NONE)
                                 desc->irqs_unhandled -= ok;
                 }