--- drivers/staging/hv/Vmbus.c
+++ drivers/staging/hv/Vmbus.c
@@ -254,7 +254,7 @@ static int VmbusOnISR(struct hv_driver *
event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
/* Since we are a child, we only need to check bit 0 */
- if (test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) {
+ if (sync_test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) {
DPRINT_DBG(VMBUS, "received event %d", event->Flags32[0]);
ret |= 0x2;
}