// SPDX-License-Identifier: GPL-2.0-or-later /* * This file contains all networking devres helpers. */ #include <linux/device.h> #include <linux/etherdevice.h> #include <linux/netdevice.h> struct net_device_devres { struct net_device *ndev; }; static void devm_free_netdev(struct device *dev, void *this) { struct net_device_devres *res = this; free_netdev(res->ndev); } struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv, unsigned int txqs, unsigned int rxqs) { struct net_device_devres *dr; dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL); if (!dr) return NULL; dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs); if (!dr->ndev) { devres_free(dr); return NULL; } devres_add(dev, dr); return dr->ndev; } EXPORT_SYMBOL(devm_alloc_etherdev_mqs); static void devm_unregister_netdev(struct device *dev, void *this) { struct net_device_devres *res = this; unregister_netdev(res->ndev); } static int netdev_devres_match(struct device *dev, void *this, void *match_data) { struct net_device_devres *res = this; struct net_device *ndev = match_data; return ndev == res->ndev; } /** * devm_register_netdev - resource managed variant of register_netdev() * @dev: managing device for this netdev - usually the parent device * @ndev: device to register * * This is a devres variant of register_netdev() for which the unregister * function will be call automatically when the managing device is * detached. Note: the net_device used must also be resource managed by * the same struct device. */ int devm_register_netdev(struct device *dev, struct net_device *ndev) { struct net_device_devres *dr; int ret; /* struct net_device must itself be managed. For now a managed netdev * can only be allocated by devm_alloc_etherdev_mqs() so the check is * straightforward. */ if (WARN_ON(!devres_find(dev, devm_free_netdev, netdev_devres_match, ndev))) return -EINVAL; dr = devres_alloc(devm_unregister_netdev, sizeof(*dr), GFP_KERNEL); if (!dr) return -ENOMEM; ret = register_netdev(ndev); if (ret) { devres_free(dr); return ret; } dr->ndev = ndev; devres_add(ndev->dev.parent, dr); return 0; } EXPORT_SYMBOL(devm_register_netdev);