617d3c7a50
Some of the comment blocks are floating in limbo between two functions, or between blocks of code. Delete the extra line feeds between any comment and its associated following block of code, to be consistent with the majority of the rest of the kernel. Also delete trailing newlines at EOF and fix a couple trivial typos in existing comments. This is a 100% cosmetic change with no runtime impact. We get rid of over 500 lines of non-code, and being blank line deletes, they won't even show up as noise in git blame. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/*
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* net/tipc/handler.c: TIPC signal handling
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*
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* Copyright (c) 2000-2006, Ericsson AB
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* Copyright (c) 2005, 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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struct queue_item {
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struct list_head next_signal;
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void (*handler) (unsigned long);
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unsigned long data;
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};
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static struct kmem_cache *tipc_queue_item_cache;
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static struct list_head signal_queue_head;
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static DEFINE_SPINLOCK(qitem_lock);
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static int handler_enabled;
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static void process_signal_queue(unsigned long dummy);
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static DECLARE_TASKLET_DISABLED(tipc_tasklet, process_signal_queue, 0);
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unsigned int tipc_k_signal(Handler routine, unsigned long argument)
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{
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struct queue_item *item;
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if (!handler_enabled) {
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err("Signal request ignored by handler\n");
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return -ENOPROTOOPT;
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}
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spin_lock_bh(&qitem_lock);
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item = kmem_cache_alloc(tipc_queue_item_cache, GFP_ATOMIC);
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if (!item) {
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err("Signal queue out of memory\n");
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spin_unlock_bh(&qitem_lock);
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return -ENOMEM;
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}
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item->handler = routine;
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item->data = argument;
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list_add_tail(&item->next_signal, &signal_queue_head);
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spin_unlock_bh(&qitem_lock);
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tasklet_schedule(&tipc_tasklet);
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return 0;
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}
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static void process_signal_queue(unsigned long dummy)
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{
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struct queue_item *__volatile__ item;
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struct list_head *l, *n;
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spin_lock_bh(&qitem_lock);
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list_for_each_safe(l, n, &signal_queue_head) {
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item = list_entry(l, struct queue_item, next_signal);
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list_del(&item->next_signal);
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spin_unlock_bh(&qitem_lock);
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item->handler(item->data);
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spin_lock_bh(&qitem_lock);
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kmem_cache_free(tipc_queue_item_cache, item);
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}
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spin_unlock_bh(&qitem_lock);
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}
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int tipc_handler_start(void)
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{
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tipc_queue_item_cache =
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kmem_cache_create("tipc_queue_items", sizeof(struct queue_item),
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0, SLAB_HWCACHE_ALIGN, NULL);
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if (!tipc_queue_item_cache)
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return -ENOMEM;
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INIT_LIST_HEAD(&signal_queue_head);
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tasklet_enable(&tipc_tasklet);
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handler_enabled = 1;
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return 0;
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}
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void tipc_handler_stop(void)
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{
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struct list_head *l, *n;
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struct queue_item *item;
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if (!handler_enabled)
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return;
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handler_enabled = 0;
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tasklet_disable(&tipc_tasklet);
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tasklet_kill(&tipc_tasklet);
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spin_lock_bh(&qitem_lock);
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list_for_each_safe(l, n, &signal_queue_head) {
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item = list_entry(l, struct queue_item, next_signal);
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list_del(&item->next_signal);
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kmem_cache_free(tipc_queue_item_cache, item);
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}
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spin_unlock_bh(&qitem_lock);
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kmem_cache_destroy(tipc_queue_item_cache);
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}
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