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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9db9fdd198
Postpone the actions of notifying subscriptions until after node lock is released, avoiding to asynchronously execute registered handlers when node is lost. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
/*
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* net/tipc/node_subscr.c: TIPC "node down" subscription handling
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*
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* Copyright (c) 1995-2006, Ericsson AB
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* Copyright (c) 2005, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "node_subscr.h"
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#include "node.h"
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/**
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* tipc_nodesub_subscribe - create "node down" subscription for specified node
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*/
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void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
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void *usr_handle, net_ev_handler handle_down)
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{
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if (in_own_node(addr)) {
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node_sub->node = NULL;
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return;
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}
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node_sub->node = tipc_node_find(addr);
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if (!node_sub->node) {
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pr_warn("Node subscription rejected, unknown node 0x%x\n",
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addr);
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return;
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}
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node_sub->handle_node_down = handle_down;
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node_sub->usr_handle = usr_handle;
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tipc_node_lock(node_sub->node);
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list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
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tipc_node_unlock(node_sub->node);
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}
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/**
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* tipc_nodesub_unsubscribe - cancel "node down" subscription (if any)
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*/
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void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
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{
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if (!node_sub->node)
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return;
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tipc_node_lock(node_sub->node);
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list_del_init(&node_sub->nodesub_list);
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tipc_node_unlock(node_sub->node);
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}
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/**
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* tipc_nodesub_notify - notify subscribers that a node is unreachable
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*
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* Note: node is locked by caller
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*/
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void tipc_nodesub_notify(struct list_head *nsub_list)
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{
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struct tipc_node_subscr *ns, *safe;
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list_for_each_entry_safe(ns, safe, nsub_list, nodesub_list) {
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if (ns->handle_node_down) {
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ns->handle_node_down(ns->usr_handle);
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ns->handle_node_down = NULL;
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}
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}
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}
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