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net: devres: provide devm_register_netdev() 

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>
This commit is contained in:
Bartosz Golaszewski 2020-05-23 15:27:10 +02:00 committed by David S. Miller
parent f75063abc3
commit cd16627fc0
3 changed files with 58 additions and 0 deletions
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1
Documentation/driver-api/driver-model/devres.rst
View File

@ -375,6 +375,7 @@ MUX
NET
devm_alloc_etherdev()
devm_alloc_etherdev_mqs()
devm_register_netdev()
PER-CPU MEM
devm_alloc_percpu()

2
include/linux/netdevice.h
View File

@ -4280,6 +4280,8 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
int register_netdev(struct net_device *dev);
void unregister_netdev(struct net_device *dev);
int devm_register_netdev(struct device *dev, struct net_device *ndev);
/* General hardware address lists handling functions */
int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list, int addr_len);

55
net/devres.c
View File

@ -38,3 +38,58 @@ struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
return dr->ndev;
}
EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
static void devm_netdev_release(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_netdev_release, 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);