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-rw-r--r--block/qcow.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/qcow.c b/block/qcow.c
index e155d3c002..8f2bdfda51 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -159,6 +159,8 @@ static int qcow_open(BlockDriverState *bs, int flags)
goto fail;
bs->backing_file[len] = '\0';
}
+
+ qemu_co_mutex_init(&s->lock);
return 0;
fail: