xen/events: Mask a moving irq

[pandora-kernel.git] / drivers / xen / events.c

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index bcf7711..7131973 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -337,6 +337,12 @@ static inline int test_evtchn(int port)
        return sync_test_bit(port, &s->evtchn_pending[0]);
 }
 
+static inline int test_and_set_mask(int port)
+{
+       struct shared_info *s = HYPERVISOR_shared_info;
+       return sync_test_and_set_bit(port, &s->evtchn_mask[0]);
+}
+
 
 /**
  * notify_remote_via_irq - send event to remote end of event channel via irq
@@ -507,9 +513,19 @@ static void eoi_pirq(struct irq_data *data)
        struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
        int rc = 0;
 
-       irq_move_irq(data);
+       if (!VALID_EVTCHN(evtchn))
+               return;
 
-       if (VALID_EVTCHN(evtchn))
+       if (unlikely(irqd_is_setaffinity_pending(data))) {
+               int masked = test_and_set_mask(evtchn);
+
+               clear_evtchn(evtchn);
+
+               irq_move_masked_irq(data);
+
+               if (!masked)
+                       unmask_evtchn(evtchn);
+       } else
                clear_evtchn(evtchn);
 
        if (pirq_needs_eoi(data->irq)) {
@@ -1427,9 +1443,19 @@ static void ack_dynirq(struct irq_data *data)
 {
        int evtchn = evtchn_from_irq(data->irq);
 
-       irq_move_irq(data);
+       if (!VALID_EVTCHN(evtchn))
+               return;
+
+       if (unlikely(irqd_is_setaffinity_pending(data))) {
+               int masked = test_and_set_mask(evtchn);
 
-       if (VALID_EVTCHN(evtchn))
+               clear_evtchn(evtchn);
+
+               irq_move_masked_irq(data);
+
+               if (!masked)
+                       unmask_evtchn(evtchn);
+       } else
                clear_evtchn(evtchn);
 }