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-rw-r--r--block/nbd-client.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 10fcc9e81d..0dc12c2d67 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -182,7 +182,7 @@ static void nbd_coroutine_start(NBDClientSession *s,
     /* Poor man semaphore.  The free_sema is locked when no other request
      * can be accepted, and unlocked after receiving one reply.  */
     if (s->in_flight == MAX_NBD_REQUESTS) {
-        qemu_co_queue_wait(&s->free_sema);
+        qemu_co_queue_wait(&s->free_sema, NULL);
         assert(s->in_flight < MAX_NBD_REQUESTS);
     }
     s->in_flight++;