[PARISC] Allow nested interrupts

Our prior mode of operation didn't allow nested interrupts
because it makes the interrupt code much simpler.  However,
nested interrupts are better for latency.

This code uses the EIEM register to simulate level interrupts
and thus achieve nesting.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.c
index 1fbda77cefc2..90489ade632e 100644
--- a/drivers/parisc/iosapic.c
+++ b/drivers/parisc/iosapic.c
@@ -692,6 +692,7 @@ static void iosapic_end_irq(unsigned int irq)
         DBG(KERN_DEBUG "end_irq(%d): eoi(%p, 0x%x)\n", irq,
                         vi->eoi_addr, vi->eoi_data);
         iosapic_eoi(vi->eoi_addr, vi->eoi_data);
+        cpu_end_irq(irq);
 }
 
 static unsigned int iosapic_startup_irq(unsigned int irq)
@@ -728,7 +729,7 @@ static struct hw_interrupt_type iosapic_interrupt_type = {
         .shutdown =     iosapic_disable_irq,
         .enable =       iosapic_enable_irq,
         .disable =      iosapic_disable_irq,
-        .ack =          no_ack_irq,
+        .ack =          cpu_ack_irq,
         .end =          iosapic_end_irq,
 #ifdef CONFIG_SMP
         .set_affinity = iosapic_set_affinity_irq,