1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * This file contains all networking devres helpers.
6 #include <linux/device.h>
7 #include <linux/etherdevice.h>
8 #include <linux/netdevice.h>
10 struct net_device_devres {
11 struct net_device *ndev;
14 static void devm_free_netdev(struct device *dev, void *this)
16 struct net_device_devres *res = this;
18 free_netdev(res->ndev);
21 struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
22 unsigned int txqs, unsigned int rxqs)
24 struct net_device_devres *dr;
26 dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
30 dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
40 EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
42 static void devm_unregister_netdev(struct device *dev, void *this)
44 struct net_device_devres *res = this;
46 unregister_netdev(res->ndev);
49 static int netdev_devres_match(struct device *dev, void *this, void *match_data)
51 struct net_device_devres *res = this;
52 struct net_device *ndev = match_data;
54 return ndev == res->ndev;
58 * devm_register_netdev - resource managed variant of register_netdev()
59 * @dev: managing device for this netdev - usually the parent device
60 * @ndev: device to register
62 * This is a devres variant of register_netdev() for which the unregister
63 * function will be called automatically when the managing device is
64 * detached. Note: the net_device used must also be resource managed by
65 * the same struct device.
67 int devm_register_netdev(struct device *dev, struct net_device *ndev)
69 struct net_device_devres *dr;
72 /* struct net_device must itself be managed. For now a managed netdev
73 * can only be allocated by devm_alloc_etherdev_mqs() so the check is
76 if (WARN_ON(!devres_find(dev, devm_free_netdev,
77 netdev_devres_match, ndev)))
80 dr = devres_alloc(devm_unregister_netdev, sizeof(*dr), GFP_KERNEL);
84 ret = register_netdev(ndev);
91 devres_add(ndev->dev.parent, dr);
95 EXPORT_SYMBOL(devm_register_netdev);