From: Eli Cohen <elic@nvidia.com>
Date: Thu, 9 Sep 2021 09:37:38 +0300
Subject: vdpa/mlx5: Avoid executing set_vq_ready() if device is reset
Patch-mainline: v5.15-rc4
Git-commit: 759be8993b1b40e05b8908583336b8e230e67b08
References: jsc#PED-1549

Avoid executing set_vq_ready() if the device has been reset. In such
case, the features are cleared and cannot be used in conditional
statements. Such reference happens is the function ctrl_vq_idx().

Fixes: 52893733f2c5 ("vdpa/mlx5: Add multiqueue support")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210909063738.46970-1-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1714,6 +1714,9 @@ static void mlx5_vdpa_set_vq_ready(struc
 	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
 	struct mlx5_vdpa_virtqueue *mvq;
 
+	if (!mvdev->actual_features)
+		return;
+
 	if (!is_index_valid(mvdev, idx))
 		return;