[Qemu-block] [PATCH] nbd: use client_close() when negotiate phase fails

[Daniel P. Berrange]

When nbd_negotiate() fails, nbd_co_client_start() is
directly calling client->close(). This eventually
ends up calling nbd_client_put(), which does an
assert(client->closing). Unfortunately we have not
set the 'closing' flag, so the code now aborts. This
bug was accidentally introduced in

  commit ee7d7aabdaea4484e069cb99c9fc54e8cb24b56f
  Author: Fam Zheng <address@hidden>
  Date:   Thu Jan 14 16:41:01 2016 +0800

    nbd: Always call "close_fn" in nbd_client_new

The simple fix is to not directly call client->close()
but instead call the client_close() method, which
takes care todo the right sequence of steps to close
the client.

Signed-off-by: Daniel P. Berrange <address@hidden>
---
 nbd/server.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/nbd/server.c b/nbd/server.c
index eead339..c29ba5f 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -1080,8 +1080,7 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
         nbd_export_get(exp);
     }
     if (nbd_negotiate(data)) {
-        shutdown(client->sock, 2);
-        client->close(client);
+        client_close(client);
         goto out;
     }
     qemu_co_mutex_init(&client->send_lock);
-- 
2.5.0