qcow: initialize coroutine mutex

commit 52b8eb60132b27ad53476490e9d7579003390cfa added a mutex,
but never initialized it.  This caused a segfault.

Reported-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block/qcow.c b/block/qcow.c
index e155d3c002f32832f60a0ff6750c01293d187834..8f2bdfda51f0a241791dc7b2a2bfd3fd5f8e6f49 100644 (file)
--- 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: