https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 7e18e42e4b280c85b76967a9106a13ca61c16179 authored by Linus Torvalds on 04 September 2022, 20:10:01 UTC
Linux 6.0-rc4
Linux 6.0-rc4
Tip revision: 7e18e42
af_nfc.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2011 Instituto Nokia de Tecnologia
*
* Authors:
* Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
* Lauro Ramos Venancio <lauro.venancio@openbossa.org>
*/
#include <linux/nfc.h>
#include <linux/module.h>
#include "nfc.h"
static DEFINE_RWLOCK(proto_tab_lock);
static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX];
static int nfc_sock_create(struct net *net, struct socket *sock, int proto,
int kern)
{
int rc = -EPROTONOSUPPORT;
if (net != &init_net)
return -EAFNOSUPPORT;
if (proto < 0 || proto >= NFC_SOCKPROTO_MAX)
return -EINVAL;
read_lock(&proto_tab_lock);
if (proto_tab[proto] && try_module_get(proto_tab[proto]->owner)) {
rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern);
module_put(proto_tab[proto]->owner);
}
read_unlock(&proto_tab_lock);
return rc;
}
static const struct net_proto_family nfc_sock_family_ops = {
.owner = THIS_MODULE,
.family = PF_NFC,
.create = nfc_sock_create,
};
int nfc_proto_register(const struct nfc_protocol *nfc_proto)
{
int rc;
if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX)
return -EINVAL;
rc = proto_register(nfc_proto->proto, 0);
if (rc)
return rc;
write_lock(&proto_tab_lock);
if (proto_tab[nfc_proto->id])
rc = -EBUSY;
else
proto_tab[nfc_proto->id] = nfc_proto;
write_unlock(&proto_tab_lock);
if (rc)
proto_unregister(nfc_proto->proto);
return rc;
}
EXPORT_SYMBOL(nfc_proto_register);
void nfc_proto_unregister(const struct nfc_protocol *nfc_proto)
{
write_lock(&proto_tab_lock);
proto_tab[nfc_proto->id] = NULL;
write_unlock(&proto_tab_lock);
proto_unregister(nfc_proto->proto);
}
EXPORT_SYMBOL(nfc_proto_unregister);
int __init af_nfc_init(void)
{
return sock_register(&nfc_sock_family_ops);
}
void __exit af_nfc_exit(void)
{
sock_unregister(PF_NFC);
}