[PATCH 5.16 0725/1017] vsock/virtio: enable VQs early on probe

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 09:15:03 EST

From: Stefano Garzarella <sgarzare@xxxxxxxxxx>

[ Upstream commit 88704454ef8b00ea91537ae0d47d9348077e0e72 ]

virtio spec requires drivers to set DRIVER_OK before using VQs.
This is set automatically after probe returns, but virtio-vsock
driver uses VQs in the probe function to fill rx and event VQs
with new buffers.

Let's fix this, calling virtio_device_ready() before using VQs
in the probe function.

Fixes: 0ea9e1d3a9e3 ("VSOCK: Introduce virtio_transport.ko")
Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
net/vmw_vsock/virtio_transport.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 4a8548bdf86c..c5f936fbf876 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -627,6 +627,8 @@ static int virtio_vsock_probe(struct virtio_device *vdev)

vdev->priv = vsock;

+ virtio_device_ready(vdev);
vsock->tx_run = true;