[ARM] Quieten spurious IRQ detection

Only issue a "nobody cared" warning after 99900 spurious interrupts.
This avoids the occasional spurious interrupt causing warnings, as
per x86.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 9 insertions, 3 deletions

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 1d50d2b98f55..2d5896b36181 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -305,14 +305,19 @@ report_bad_irq(unsigned int irq, struct pt_regs *regs, struct irqdesc *desc, int
         static int count = 100;
         struct irqaction *action;
 
-        if (!count || noirqdebug)
+        if (noirqdebug)
                 return;
 
-        count--;
-
         if (ret != IRQ_HANDLED && ret != IRQ_NONE) {
+                if (!count)
+                        return;
+                count--;
                 printk("irq%u: bogus retval mask %x\n", irq, ret);
         } else {
+                desc->irqs_unhandled++;
+                if (desc->irqs_unhandled <= 99900)
+                        return;
+                desc->irqs_unhandled = 0;
                 printk("irq%u: nobody cared\n", irq);
         }
         show_regs(regs);
diff --git a/include/asm-arm/mach/irq.h b/include/asm-arm/mach/irq.h
index 76d05244c632..d4d420ecf3a8 100644
--- a/include/asm-arm/mach/irq.h
+++ b/include/asm-arm/mach/irq.h
@@ -74,6 +74,7 @@ struct irqdesc {
         unsigned int    noautoenable : 1;       /* don't automatically enable IRQ */
         unsigned int    unused   :25;
 
+        unsigned int    irqs_unhandled;
         struct proc_dir_entry *procdir;
 
 #ifdef CONFIG_SMP