mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Allan Stephens](/assets/img/avatar_default.png)
This patch corrects many places where TIPC routines indicated successful completion by returning TIPC_OK instead of 0. (The TIPC_OK symbol has the value 0, but it should only be used in contexts that deal with the error code field of a TIPC message header.) Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
264 lines
6.5 KiB
C
264 lines
6.5 KiB
C
/*
|
|
* net/tipc/user_reg.c: TIPC user registry code
|
|
*
|
|
* Copyright (c) 2000-2006, Ericsson AB
|
|
* Copyright (c) 2004-2005, Wind River Systems
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "core.h"
|
|
#include "user_reg.h"
|
|
|
|
/*
|
|
* TIPC user registry keeps track of users of the tipc_port interface.
|
|
*
|
|
* The registry utilizes an array of "TIPC user" entries;
|
|
* a user's ID is the index of their associated array entry.
|
|
* Array entry 0 is not used, so userid 0 is not valid;
|
|
* TIPC sometimes uses this value to denote an anonymous user.
|
|
* The list of free entries is initially chained from last entry to entry 1.
|
|
*/
|
|
|
|
/**
|
|
* struct tipc_user - registered TIPC user info
|
|
* @next: index of next free registry entry (or -1 for an allocated entry)
|
|
* @callback: ptr to routine to call when TIPC mode changes (NULL if none)
|
|
* @usr_handle: user-defined value passed to callback routine
|
|
* @ports: list of user ports owned by the user
|
|
*/
|
|
|
|
struct tipc_user {
|
|
int next;
|
|
tipc_mode_event callback;
|
|
void *usr_handle;
|
|
struct list_head ports;
|
|
};
|
|
|
|
#define MAX_USERID 64
|
|
#define USER_LIST_SIZE ((MAX_USERID + 1) * sizeof(struct tipc_user))
|
|
|
|
static struct tipc_user *users = NULL;
|
|
static u32 next_free_user = MAX_USERID + 1;
|
|
static DEFINE_SPINLOCK(reg_lock);
|
|
|
|
/**
|
|
* reg_init - create TIPC user registry (but don't activate it)
|
|
*
|
|
* If registry has been pre-initialized it is left "as is".
|
|
* NOTE: This routine may be called when TIPC is inactive.
|
|
*/
|
|
|
|
static int reg_init(void)
|
|
{
|
|
u32 i;
|
|
|
|
spin_lock_bh(®_lock);
|
|
if (!users) {
|
|
users = kzalloc(USER_LIST_SIZE, GFP_ATOMIC);
|
|
if (users) {
|
|
for (i = 1; i <= MAX_USERID; i++) {
|
|
users[i].next = i - 1;
|
|
}
|
|
next_free_user = MAX_USERID;
|
|
}
|
|
}
|
|
spin_unlock_bh(®_lock);
|
|
return users ? 0 : -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* reg_callback - inform TIPC user about current operating mode
|
|
*/
|
|
|
|
static void reg_callback(struct tipc_user *user_ptr)
|
|
{
|
|
tipc_mode_event cb;
|
|
void *arg;
|
|
|
|
spin_lock_bh(®_lock);
|
|
cb = user_ptr->callback;
|
|
arg = user_ptr->usr_handle;
|
|
spin_unlock_bh(®_lock);
|
|
|
|
if (cb)
|
|
cb(arg, tipc_mode, tipc_own_addr);
|
|
}
|
|
|
|
/**
|
|
* tipc_reg_start - activate TIPC user registry
|
|
*/
|
|
|
|
int tipc_reg_start(void)
|
|
{
|
|
u32 u;
|
|
int res;
|
|
|
|
if ((res = reg_init()))
|
|
return res;
|
|
|
|
for (u = 1; u <= MAX_USERID; u++) {
|
|
if (users[u].callback)
|
|
tipc_k_signal((Handler)reg_callback,
|
|
(unsigned long)&users[u]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_reg_stop - shut down & delete TIPC user registry
|
|
*/
|
|
|
|
void tipc_reg_stop(void)
|
|
{
|
|
int id;
|
|
|
|
if (!users)
|
|
return;
|
|
|
|
for (id = 1; id <= MAX_USERID; id++) {
|
|
if (users[id].callback)
|
|
reg_callback(&users[id]);
|
|
}
|
|
kfree(users);
|
|
users = NULL;
|
|
}
|
|
|
|
/**
|
|
* tipc_attach - register a TIPC user
|
|
*
|
|
* NOTE: This routine may be called when TIPC is inactive.
|
|
*/
|
|
|
|
int tipc_attach(u32 *userid, tipc_mode_event cb, void *usr_handle)
|
|
{
|
|
struct tipc_user *user_ptr;
|
|
|
|
if ((tipc_mode == TIPC_NOT_RUNNING) && !cb)
|
|
return -ENOPROTOOPT;
|
|
if (!users)
|
|
reg_init();
|
|
|
|
spin_lock_bh(®_lock);
|
|
if (!next_free_user) {
|
|
spin_unlock_bh(®_lock);
|
|
return -EBUSY;
|
|
}
|
|
user_ptr = &users[next_free_user];
|
|
*userid = next_free_user;
|
|
next_free_user = user_ptr->next;
|
|
user_ptr->next = -1;
|
|
spin_unlock_bh(®_lock);
|
|
|
|
user_ptr->callback = cb;
|
|
user_ptr->usr_handle = usr_handle;
|
|
INIT_LIST_HEAD(&user_ptr->ports);
|
|
atomic_inc(&tipc_user_count);
|
|
|
|
if (cb && (tipc_mode != TIPC_NOT_RUNNING))
|
|
tipc_k_signal((Handler)reg_callback, (unsigned long)user_ptr);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_detach - deregister a TIPC user
|
|
*/
|
|
|
|
void tipc_detach(u32 userid)
|
|
{
|
|
struct tipc_user *user_ptr;
|
|
struct list_head ports_temp;
|
|
struct user_port *up_ptr, *temp_up_ptr;
|
|
|
|
if ((userid == 0) || (userid > MAX_USERID))
|
|
return;
|
|
|
|
spin_lock_bh(®_lock);
|
|
if ((!users) || (users[userid].next >= 0)) {
|
|
spin_unlock_bh(®_lock);
|
|
return;
|
|
}
|
|
|
|
user_ptr = &users[userid];
|
|
user_ptr->callback = NULL;
|
|
INIT_LIST_HEAD(&ports_temp);
|
|
list_splice(&user_ptr->ports, &ports_temp);
|
|
user_ptr->next = next_free_user;
|
|
next_free_user = userid;
|
|
spin_unlock_bh(®_lock);
|
|
|
|
atomic_dec(&tipc_user_count);
|
|
|
|
list_for_each_entry_safe(up_ptr, temp_up_ptr, &ports_temp, uport_list) {
|
|
tipc_deleteport(up_ptr->ref);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_reg_add_port - register a user's driver port
|
|
*/
|
|
|
|
int tipc_reg_add_port(struct user_port *up_ptr)
|
|
{
|
|
struct tipc_user *user_ptr;
|
|
|
|
if (up_ptr->user_ref == 0)
|
|
return 0;
|
|
if (up_ptr->user_ref > MAX_USERID)
|
|
return -EINVAL;
|
|
if ((tipc_mode == TIPC_NOT_RUNNING) || !users )
|
|
return -ENOPROTOOPT;
|
|
|
|
spin_lock_bh(®_lock);
|
|
user_ptr = &users[up_ptr->user_ref];
|
|
list_add(&up_ptr->uport_list, &user_ptr->ports);
|
|
spin_unlock_bh(®_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_reg_remove_port - deregister a user's driver port
|
|
*/
|
|
|
|
int tipc_reg_remove_port(struct user_port *up_ptr)
|
|
{
|
|
if (up_ptr->user_ref == 0)
|
|
return 0;
|
|
if (up_ptr->user_ref > MAX_USERID)
|
|
return -EINVAL;
|
|
if (!users )
|
|
return -ENOPROTOOPT;
|
|
|
|
spin_lock_bh(®_lock);
|
|
list_del_init(&up_ptr->uport_list);
|
|
spin_unlock_bh(®_lock);
|
|
return 0;
|
|
}
|
|
|