[dpdk-stable] [PATCH] vhost: fix deadlock on port deletion

[Maxime Coquelin]

On 1/14/20 7:53 PM, Maxime Coquelin wrote:
> If the vhost-user application (e.g. OVS) deletes the vhost-user
> port while Qemu sends a vhost-user request, a deadlock can
> happen if the request handler tries to acquire vhost-user's
> global mutex, which is also locked by the vhost-user port
> deletion API (rte_vhost_driver_unregister).
> 
> This patch prevents the deadlock by making
> rte_vhost_driver_unregister() to release the mutex and try
> again if a request is being handled to give a chance to
> the request handler to complete.
> 
> Fixes: 8b4b949144b8 ("vhost: fix dead lock on closing in server mode")
> Fixes: 5fbb3941da9f ("vhost: introduce driver features related APIs")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
>  lib/librte_vhost/socket.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)


Applied to dpdk-next-virtio/master

Thanks to the reviewers,
Maxime