// 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);