Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

[pandora-kernel.git] / kernel / irq / chip.c

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 4a0952d..ac1f850 100644 (file)
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -252,7 +252,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
        mask_ack_irq(desc, irq);
 
        if (unlikely(desc->status & IRQ_INPROGRESS))
-               goto out;
+               goto out_unlock;
        desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
        kstat_cpu(cpu).irqs[irq]++;
 
@@ -261,10 +261,13 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
         * keep it masked and get out of here
         */
        action = desc->action;
-       if (unlikely(!action || (desc->status & IRQ_DISABLED)))
-               goto out;
+       if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
+               desc->status |= IRQ_PENDING;
+               goto out_unlock;
+       }
 
        desc->status |= IRQ_INPROGRESS;
+       desc->status &= ~IRQ_PENDING;
        spin_unlock(&desc->lock);
 
        action_ret = handle_IRQ_event(irq, regs, action);
@@ -273,9 +276,9 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs)
 
        spin_lock(&desc->lock);
        desc->status &= ~IRQ_INPROGRESS;
-out:
        if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
                desc->chip->unmask(irq);
+out_unlock:
        spin_unlock(&desc->lock);
 }
 
@@ -462,9 +465,18 @@ __set_irq_handler(unsigned int irq,
        if (!handle)
                handle = handle_bad_irq;
 
-       if (is_chained && desc->chip == &no_irq_chip)
-               printk(KERN_WARNING "Trying to install "
-                      "chained interrupt type for IRQ%d\n", irq);
+       if (desc->chip == &no_irq_chip) {
+               printk(KERN_WARNING "Trying to install %sinterrupt handler "
+                      "for IRQ%d\n", is_chained ? "chained " : " ", irq);
+               /*
+                * Some ARM implementations install a handler for really dumb
+                * interrupt hardware without setting an irq_chip. This worked
+                * with the ARM no_irq_chip but the check in setup_irq would
+                * prevent us to setup the interrupt at all. Switch it to
+                * dummy_irq_chip for easy transition.
+                */
+               desc->chip = &dummy_irq_chip;
+       }
 
        spin_lock_irqsave(&desc->lock, flags);