parisc: Filter out spurious interrupts in PA-RISC irq handler

[pandora-kernel.git] / arch / parisc / kernel / irq.c

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index c0b1aff..88934b3 100644 (file)
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -336,8 +336,8 @@ void do_cpu_irq_mask(struct pt_regs *regs)
        struct pt_regs *old_regs;
        unsigned long eirr_val;
        int irq, cpu = smp_processor_id();
-#ifdef CONFIG_SMP
        struct irq_desc *desc;
+#ifdef CONFIG_SMP
        cpumask_t dest;
 #endif
 
@@ -350,8 +350,12 @@ void do_cpu_irq_mask(struct pt_regs *regs)
                goto set_out;
        irq = eirr_to_irq(eirr_val);
 
-#ifdef CONFIG_SMP
+       /* Filter out spurious interrupts, mostly from serial port at bootup */
        desc = irq_to_desc(irq);
+       if (unlikely(!desc->action))
+               goto set_out;
+
+#ifdef CONFIG_SMP
        cpumask_copy(&dest, desc->irq_data.affinity);
        if (irqd_is_per_cpu(&desc->irq_data) &&
            !cpu_isset(smp_processor_id(), dest)) {