[dpdk-dev] [PATCH v2] vhost: fix missing virtqueue status check in async path

[patrick.fu@intel.com]

From: Patrick Fu <patrick.fu@intel.com>

Vring should not be touched if vq is disabled. This patch adds the vq
status check in async enqueue polling to avoid accessing to a disabled
queue.

Fixes: cd6760da1076 ("vhost: introduce async enqueue for split ring")

Signed-off-by: Patrick Fu <patrick.fu@intel.com>
---
v2:
 revise commit title

 lib/librte_vhost/virtio_net.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 1d0be3dd4..b197d76d3 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1686,9 +1686,11 @@ uint16_t rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id,
 
 	if (n_pkts_put) {
 		vq->async_pkts_inflight_n -= n_pkts_put;
-		__atomic_add_fetch(&vq->used->idx, n_descs, __ATOMIC_RELEASE);
-
-		vhost_vring_call_split(dev, vq);
+		if (likely(vq->enabled && vq->access_ok)) {
+			__atomic_add_fetch(&vq->used->idx,
+					n_descs, __ATOMIC_RELEASE);
+			vhost_vring_call_split(dev, vq);
+		}
 	}
 
 	if (start_idx + n_pkts_put <= vq_size) {
-- 
2.18.4