[dpdk-dev] [PATCH v2] net/virtio: fix crash when device reconnecting

[Marvin Liu <yong.liu@intel.com>]

When doing virtio device initialization, virtqueues will be reset in
server mode if ring type is packed. It will cause issue because queues
have been freed in the beginning of device initialization.

Fix this issue by checking whether device has been initialized before
reset. If device hasn't been initialized, there's no need to reset
queues.

Fixes: 6ebbf4109f35 ("net/virtio-user: fix packed ring server mode")

Signed-off-by: Marvin Liu <yong.liu@intel.com>

diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index c54698ad1..55bd81f0b 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -89,7 +89,8 @@ virtio_user_server_reconnect(struct virtio_user_dev *dev)
 	dev->features &= dev->device_features;
 
 	/* For packed ring, resetting queues is required in reconnection. */
-	if (vtpci_packed_queue(hw)) {
+	if (vtpci_packed_queue(hw) &&
+	   (vtpci_get_status(hw) & VIRTIO_CONFIG_STATUS_DRIVER_OK)) {
 		PMD_INIT_LOG(NOTICE, "Packets on the fly will be dropped"
 				" when packed ring reconnecting.");
 		virtio_user_reset_queues_packed(eth_dev);
-- 
2.17.1