[dpdk-dev] [PATCH 1/6] net/virtio-user: do not stop stopped device again

[Tiwei Bie <tiwei.bie@intel.com>]

Without this change, virtio-user still works, but it will show
annoying error messages like this on shutdown:

vhost_kernel_set_backend(): VHOST_NET_SET_BACKEND fails, Operation not permitted
vhost_kernel_ioctl(): VHOST_RESET_OWNER failed: Operation not permitted

Fixes: e3b434818bbb ("net/virtio-user: support kernel vhost")
Fixes: 12ecb2f63b12 ("net/virtio-user: support memory hotplug")
Cc: stable@dpdk.org

Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index a185aed34..684702c56 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -184,6 +184,9 @@ int virtio_user_stop_device(struct virtio_user_dev *dev)
 	uint32_t i;
 
 	pthread_mutex_lock(&dev->mutex);
+	if (!dev->started)
+		goto out;
+
 	for (i = 0; i < dev->max_queue_pairs; ++i)
 		dev->ops->enable_qp(dev, i, 0);
 
@@ -193,6 +196,7 @@ int virtio_user_stop_device(struct virtio_user_dev *dev)
 		return -1;
 	}
 	dev->started = false;
+out:
 	pthread_mutex_unlock(&dev->mutex);
 
 	return 0;
-- 
2.19.1