vDPA/ifcvf: allocate the adapter in dev_add()

The adapter is the container of the vdpa_device,
this commits allocate the adapter in dev_add()
rather than in probe(). So that the vdpa_device()
could be re-created when the userspace creates
the vdpa device, and free-ed in dev_del()

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Cc: stable@vger.kernel.org
Message-Id: <20221125145724.1129962-11-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/ifcvf/ifcvf_main.c

@@ -746,12 +746,20 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 	int ret;
 
 	ifcvf_mgmt_dev = container_of(mdev, struct ifcvf_vdpa_mgmt_dev, mdev);
-	if (!ifcvf_mgmt_dev->adapter)
-		return -EOPNOTSUPP;
+	vf = &ifcvf_mgmt_dev->vf;
+	pdev = vf->pdev;
+	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
+				    &pdev->dev, &ifc_vdpa_ops, 1, 1, NULL, false);
+	if (IS_ERR(adapter)) {
+		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
+		return PTR_ERR(adapter);
+	}
 
-	adapter = ifcvf_mgmt_dev->adapter;
-	vf = adapter->vf;
-	pdev = adapter->pdev;
+	ifcvf_mgmt_dev->adapter = adapter;
+	adapter->pdev = pdev;
+	adapter->vdpa.dma_dev = &pdev->dev;
+	adapter->vdpa.mdev = mdev;
+	adapter->vf = vf;
 	vdpa_dev = &adapter->vdpa;
 
 	if (name)
@@ -769,7 +777,6 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 	return 0;
 }
 
-
 static void ifcvf_vdpa_dev_del(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev)
 {
 	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
@@ -788,7 +795,6 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
 	struct device *dev = &pdev->dev;
-	struct ifcvf_adapter *adapter;
 	struct ifcvf_hw *vf;
 	u32 dev_type;
 	int ret, i;
@@ -825,24 +831,10 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return -ENOMEM;
 	}
 
-	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
-				    dev, &ifc_vdpa_ops, 1, 1, NULL, false);
-	if (IS_ERR(adapter)) {
-		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
-		ret = PTR_ERR(adapter);
-		goto err;
-	}
-
-	adapter->pdev = pdev;
-	adapter->vdpa.dma_dev = &pdev->dev;
-	adapter->vdpa.mdev = &ifcvf_mgmt_dev->mdev;
-	ifcvf_mgmt_dev->adapter = adapter;
-
 	vf = &ifcvf_mgmt_dev->vf;
 	vf->dev_type = get_dev_type(pdev);
 	vf->base = pcim_iomap_table(pdev);
 	vf->pdev = pdev;
-	adapter->vf = vf;
 
 	ret = ifcvf_init_hw(vf, pdev);
 	if (ret) {