[PATCH V1] vdpa: suspend and resume require DRIVER_OK

[Steve Sistare]

Calling suspend or resume requires VIRTIO_CONFIG_S_DRIVER_OK, for all
vdpa devices.

Suggested-by: Eugenio Perez Martin <eperezma@xxxxxxxxxx>"
Signed-off-by: Steve Sistare <steven.sistare@xxxxxxxxxx>
---
 drivers/vhost/vdpa.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index bc4a51e4638b..ce1882acfc3b 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -598,6 +598,9 @@ static long vhost_vdpa_suspend(struct vhost_vdpa *v)
 	if (!ops->suspend)
 		return -EOPNOTSUPP;
 
+	if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))
+		return -EINVAL;
+
 	ret = ops->suspend(vdpa);
 	if (!ret)
 		v->suspended = true;
@@ -618,6 +621,9 @@ static long vhost_vdpa_resume(struct vhost_vdpa *v)
 	if (!ops->resume)
 		return -EOPNOTSUPP;
 
+	if (!(ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK))
+		return -EINVAL;
+
 	ret = ops->resume(vdpa);
 	if (!ret)
 		v->suspended = false;
-- 
2.39.3