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Index: head/sys/dev/hyperv/vmbus/vmbus.c
===================================================================
--- head/sys/dev/hyperv/vmbus/vmbus.c
+++ head/sys/dev/hyperv/vmbus/vmbus.c
@@ -325,7 +325,13 @@
uint32_t
vmbus_gpadl_alloc(struct vmbus_softc *sc)
{
- return atomic_fetchadd_int(&sc->vmbus_gpadl, 1);
+ uint32_t gpadl;
+
+again:
+ gpadl = atomic_fetchadd_int(&sc->vmbus_gpadl, 1);
+ if (gpadl == 0)
+ goto again;
+ return (gpadl);
}
static int

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