forked from luck/tmp_suning_uos_patched
cd16627fc0
Provide devm_register_netdev() - a device resource managed variant of register_netdev(). This new helper will only work for net_device structs that are also already managed by devres. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: David S. Miller <davem@davemloft.net>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* This file contains all networking devres helpers.
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*/
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#include <linux/device.h>
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#include <linux/etherdevice.h>
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#include <linux/netdevice.h>
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struct net_device_devres {
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struct net_device *ndev;
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};
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static void devm_free_netdev(struct device *dev, void *this)
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{
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struct net_device_devres *res = this;
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free_netdev(res->ndev);
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}
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struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
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unsigned int txqs, unsigned int rxqs)
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{
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struct net_device_devres *dr;
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dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return NULL;
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dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
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if (!dr->ndev) {
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devres_free(dr);
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return NULL;
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}
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devres_add(dev, dr);
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return dr->ndev;
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}
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EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
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static void devm_netdev_release(struct device *dev, void *this)
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{
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struct net_device_devres *res = this;
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unregister_netdev(res->ndev);
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}
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static int netdev_devres_match(struct device *dev, void *this, void *match_data)
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{
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struct net_device_devres *res = this;
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struct net_device *ndev = match_data;
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return ndev == res->ndev;
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}
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/**
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* devm_register_netdev - resource managed variant of register_netdev()
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* @dev: managing device for this netdev - usually the parent device
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* @ndev: device to register
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*
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* This is a devres variant of register_netdev() for which the unregister
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* function will be call automatically when the managing device is
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* detached. Note: the net_device used must also be resource managed by
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* the same struct device.
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*/
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int devm_register_netdev(struct device *dev, struct net_device *ndev)
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{
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struct net_device_devres *dr;
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int ret;
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/* struct net_device must itself be managed. For now a managed netdev
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* can only be allocated by devm_alloc_etherdev_mqs() so the check is
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* straightforward.
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*/
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if (WARN_ON(!devres_find(dev, devm_free_netdev,
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netdev_devres_match, ndev)))
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return -EINVAL;
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dr = devres_alloc(devm_netdev_release, sizeof(*dr), GFP_KERNEL);
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if (!dr)
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return -ENOMEM;
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ret = register_netdev(ndev);
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if (ret) {
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devres_free(dr);
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return ret;
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}
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dr->ndev = ndev;
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devres_add(ndev->dev.parent, dr);
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return 0;
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}
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EXPORT_SYMBOL(devm_register_netdev);
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