1 files changed, 2 insertions, 0 deletions
diff --git a/block/nbd.c b/block/nbd.c
index 76f04d863c..14ab2259c2 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -47,6 +47,7 @@
 #endif
 
 typedef struct BDRVNBDState {
+    CoMutex lock;
     int sock;
     uint32_t nbdflags;
     off_t size;
@@ -175,6 +176,7 @@ static int nbd_open(BlockDriverState *bs, const char* filename, int flags)
      */
     result = nbd_establish_connection(bs);
 
+    qemu_co_mutex_init(&s->lock);
     return result;
 }