Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

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

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 332dd63..0e0c285 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -734,6 +734,33 @@ static void restore_cpu_ipis(unsigned int cpu)
        }
 }
 
+/* Clear an irq's pending state, in preparation for polling on it */
+void xen_clear_irq_pending(int irq)
+{
+       int evtchn = evtchn_from_irq(irq);
+
+       if (VALID_EVTCHN(evtchn))
+               clear_evtchn(evtchn);
+}
+
+/* Poll waiting for an irq to become pending.  In the usual case, the
+   irq will be disabled so it won't deliver an interrupt. */
+void xen_poll_irq(int irq)
+{
+       evtchn_port_t evtchn = evtchn_from_irq(irq);
+
+       if (VALID_EVTCHN(evtchn)) {
+               struct sched_poll poll;
+
+               poll.nr_ports = 1;
+               poll.timeout = 0;
+               poll.ports = &evtchn;
+
+               if (HYPERVISOR_sched_op(SCHEDOP_poll, &poll) != 0)
+                       BUG();
+       }
+}
+
 void xen_irq_resume(void)
 {
        unsigned int cpu, irq, evtchn;