[PATCH] xen/events/fifo: Add missing hotplug notifier transition

[Anna-Maria Gleixner]

The evtchn_fifo_cpu_notification() hotplug callback lacks handling of
the CPU_UP_CANCELED case. That means, if CPU_UP_PREPARE fails, the
handle of the fifo events is not dropped.

Add handling for CPU_UP_CANCELED transition to drop the fifo events
handle.

Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>
---
 drivers/xen/events/events_fifo.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -432,6 +432,7 @@ static int evtchn_fifo_cpu_notification(
 			ret = evtchn_fifo_alloc_control_block(cpu);
 		break;
 	case CPU_DEAD:
+	case CPU_UP_CANCELED:
 		__evtchn_fifo_handle_events(cpu, true);
 		break;
 	default: