[linux-block.git] / net / devres.c

// 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 called 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);
Commit	Line	Data
cb8a14b2 BG	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* This file contains all networking devres helpers.
	4	*/
	5
	6	#include <linux/device.h>
	7	#include <linux/etherdevice.h>
	8	#include <linux/netdevice.h>
	9
f75063ab BG	10	struct net_device_devres {
	11	struct net_device *ndev;
	12	};
	13
	14	static void devm_free_netdev(struct device dev, void this)
cb8a14b2	15	{
f75063ab BG	16	struct net_device_devres *res = this;
	17
	18	free_netdev(res->ndev);
cb8a14b2 BG	19	}
	20
	21	struct net_device devm_alloc_etherdev_mqs(struct device dev, int sizeof_priv,
	22	unsigned int txqs, unsigned int rxqs)
	23	{
f75063ab	24	struct net_device_devres *dr;
cb8a14b2 BG	25
	26	dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
	27	if (!dr)
	28	return NULL;
	29
f75063ab BG	30	dr->ndev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
f75063ab BG	31	if (!dr->ndev) {
cb8a14b2 BG	32	devres_free(dr);
	33	return NULL;
	34	}
	35
cb8a14b2 BG	36	devres_add(dev, dr);
cb8a14b2 BG	37
f75063ab	38	return dr->ndev;
cb8a14b2 BG	39	}
cb8a14b2 BG	40	EXPORT_SYMBOL(devm_alloc_etherdev_mqs);
cd16627f	41
fe189519	42	static void devm_unregister_netdev(struct device dev, void this)
cd16627f BG	43	{
	44	struct net_device_devres *res = this;
	45
	46	unregister_netdev(res->ndev);
	47	}
	48
	49	static int netdev_devres_match(struct device dev, void this, void *match_data)
	50	{
	51	struct net_device_devres *res = this;
	52	struct net_device *ndev = match_data;
	53
	54	return ndev == res->ndev;
	55	}
	56
	57	/**
	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
	61	*
	62	* This is a devres variant of register_netdev() for which the unregister
51a1ebc3	63	* function will be called automatically when the managing device is
cd16627f BG	64	* detached. Note: the net_device used must also be resource managed by
	65	* the same struct device.
	66	*/
	67	int devm_register_netdev(struct device dev, struct net_device ndev)
	68	{
	69	struct net_device_devres *dr;
	70	int ret;
	71
	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
	74	* straightforward.
	75	*/
	76	if (WARN_ON(!devres_find(dev, devm_free_netdev,
	77	netdev_devres_match, ndev)))
	78	return -EINVAL;
	79
fe189519	80	dr = devres_alloc(devm_unregister_netdev, sizeof(*dr), GFP_KERNEL);
cd16627f BG	81	if (!dr)
	82	return -ENOMEM;
	83
	84	ret = register_netdev(ndev);
	85	if (ret) {
	86	devres_free(dr);
	87	return ret;
	88	}
	89
	90	dr->ndev = ndev;
	91	devres_add(ndev->dev.parent, dr);
	92
	93	return 0;
	94	}
	95	EXPORT_SYMBOL(devm_register_netdev);