--- 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;

}