mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
0911ab3189
When nfc proto id is using, nfc_proto_register() return -EBUSY error
code, but forgot to unregister proto. Fix it by adding proto_unregister()
in the error handling case.
Fixes: c7fe3b52c1 ("NFC: add NFC socket family")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211013034932.2833737-1-william.xuanziyang@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
89 lines
1.8 KiB
C
89 lines
1.8 KiB
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);
|
|
}
|