net: hns3: change hnae3_register_ae_dev() to int

hnae3_register_ae_dev() may fail, and it should return a error code
to its caller, so change hnae3_register_ae_dev() return type to int.

Also, when hnae3_register_ae_dev() return error, hns3_probe() should
do some error handling and return the error code.
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hnae3.c

@@ -238,7 +238,7 @@ EXPORT_SYMBOL(hnae3_unregister_ae_algo);
  * @ae_dev: the AE device
  * NOTE: the duplicated name will not be checked
  */
-void hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
+int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 {
 	const struct pci_device_id *id;
 	struct hnae3_ae_algo *ae_algo;
@@ -259,6 +259,7 @@ void hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 		if (!ae_dev->ops) {
 			dev_err(&ae_dev->pdev->dev, "ae_dev ops are null\n");
+			ret = -EOPNOTSUPP;
 			goto out_err;
 		}
 
@@ -285,8 +286,15 @@ void hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 				ret);
 	}
 
+	mutex_unlock(&hnae3_common_lock);
+
+	return 0;
+
 out_err:
+	list_del(&ae_dev->node);
 	mutex_unlock(&hnae3_common_lock);
+
+	return ret;
 }
 EXPORT_SYMBOL(hnae3_register_ae_dev);
 

drivers/net/ethernet/hisilicon/hns3/hnae3.h

@@ -587,7 +587,7 @@ struct hnae3_handle {
 #define hnae3_get_bit(origin, shift) \
 	hnae3_get_field((origin), (0x1 << (shift)), (shift))
 
-void hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev);
+int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev);
 void hnae3_unregister_ae_dev(struct hnae3_ae_dev *ae_dev);
 
 void hnae3_unregister_ae_algo(struct hnae3_ae_algo *ae_algo);

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -1752,9 +1752,13 @@ static int hns3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	hns3_get_dev_capability(pdev, ae_dev);
 	pci_set_drvdata(pdev, ae_dev);
 
-	hnae3_register_ae_dev(ae_dev);
+	ret = hnae3_register_ae_dev(ae_dev);
+	if (ret) {
+		devm_kfree(&pdev->dev, ae_dev);
+		pci_set_drvdata(pdev, NULL);
+	}
 
-	return 0;
+	return ret;
 }
 
 /* hns3_remove - Device removal routine