[Bug 981] vhost: avoid sleeping under mutex

[bugzilla@dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=981

            Bug ID: 981
           Summary: vhost: avoid sleeping under mutex
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev@dpdk.org
          Reporter: david.marchand@redhat.com
  Target Milestone: ---

Reported by covscan:

 2. dpdk-21.11/lib/vhost/socket.c:852: lock_acquire: Calling function
"pthread_mutex_lock" acquires lock "vhost_user.mutex".
23. dpdk-21.11/lib/vhost/socket.c:955: sleep: Call to
"vhost_user_reconnect_init" might sleep while holding lock "vhost_user.mutex".
#   953|                vsocket->reconnect = !(flags &
RTE_VHOST_USER_NO_RECONNECT);
#   954|                if (vsocket->reconnect && reconn_tid == 0) {
#   955|->                      if (vhost_user_reconnect_init() != 0)
#   956|                                goto out_mutex;
#   957|                }

The reason for this warning is that creating a ctrl thread might end up with
sleep() calls.

Maybe creating the ctrl thread could be moved early (out of the mutex).


Plus, comparing (pthread_t) reconn_tid against 0 is ugly.
Fixing this bz would be a good time to clean this too.

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