[PATCH] genirq: Allow fasteoi handler to retrigger disabled interrupts

Make the fasteoi handler mark disabled interrupts as pending if they
happen anyway. This allow implementation of a delayed disable scheme
with the fasteoi handler.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 54105bdfe20d..9336f2e89e40 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -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)))
+        if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
+                desc->status |= IRQ_PENDING;
                 goto out;
+        }
 
         desc->status |= IRQ_INPROGRESS;
+        desc->status &= ~IRQ_PENDING;
         spin_unlock(&desc->lock);
 
         action_ret = handle_IRQ_event(irq, regs, action);