tipc: purge signal handler infrastructure

In the previous commits of this series, we removed all asynchronous
actions which were based on the tasklet handler - "tipc_k_signal()".

So the moment has now come when we can completely remove the tasklet
handler infrastructure. That is done with this commit.

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>

1 files changed, 0 insertions, 134 deletions

diff --git a/net/tipc/handler.c b/net/tipc/handler.c
deleted file mode 100644
index 1fabf160501f..000000000000
--- a/net/tipc/handler.c
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
- * net/tipc/handler.c: TIPC signal handling
- *
- * Copyright (c) 2000-2006, Ericsson AB
- * Copyright (c) 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"
-
-struct queue_item {
-	struct list_head next_signal;
-	void (*handler) (unsigned long);
-	unsigned long data;
-};
-
-static struct kmem_cache *tipc_queue_item_cache;
-static struct list_head signal_queue_head;
-static DEFINE_SPINLOCK(qitem_lock);
-static int handler_enabled __read_mostly;
-
-static void process_signal_queue(unsigned long dummy);
-
-static DECLARE_TASKLET_DISABLED(tipc_tasklet, process_signal_queue, 0);
-
-
-unsigned int tipc_k_signal(Handler routine, unsigned long argument)
-{
-	struct queue_item *item;
-
-	spin_lock_bh(&qitem_lock);
-	if (!handler_enabled) {
-		spin_unlock_bh(&qitem_lock);
-		return -ENOPROTOOPT;
-	}
-
-	item = kmem_cache_alloc(tipc_queue_item_cache, GFP_ATOMIC);
-	if (!item) {
-		pr_err("Signal queue out of memory\n");
-		spin_unlock_bh(&qitem_lock);
-		return -ENOMEM;
-	}
-	item->handler = routine;
-	item->data = argument;
-	list_add_tail(&item->next_signal, &signal_queue_head);
-	spin_unlock_bh(&qitem_lock);
-	tasklet_schedule(&tipc_tasklet);
-	return 0;
-}
-
-static void process_signal_queue(unsigned long dummy)
-{
-	struct queue_item *__volatile__ item;
-	struct list_head *l, *n;
-
-	spin_lock_bh(&qitem_lock);
-	list_for_each_safe(l, n, &signal_queue_head) {
-		item = list_entry(l, struct queue_item, next_signal);
-		list_del(&item->next_signal);
-		spin_unlock_bh(&qitem_lock);
-		item->handler(item->data);
-		spin_lock_bh(&qitem_lock);
-		kmem_cache_free(tipc_queue_item_cache, item);
-	}
-	spin_unlock_bh(&qitem_lock);
-}
-
-int tipc_handler_start(void)
-{
-	tipc_queue_item_cache =
-		kmem_cache_create("tipc_queue_items", sizeof(struct queue_item),
-				  0, SLAB_HWCACHE_ALIGN, NULL);
-	if (!tipc_queue_item_cache)
-		return -ENOMEM;
-
-	INIT_LIST_HEAD(&signal_queue_head);
-	tasklet_enable(&tipc_tasklet);
-	handler_enabled = 1;
-	return 0;
-}
-
-void tipc_handler_stop(void)
-{
-	struct list_head *l, *n;
-	struct queue_item *item;
-
-	spin_lock_bh(&qitem_lock);
-	if (!handler_enabled) {
-		spin_unlock_bh(&qitem_lock);
-		return;
-	}
-	handler_enabled = 0;
-	spin_unlock_bh(&qitem_lock);
-
-	tasklet_kill(&tipc_tasklet);
-
-	spin_lock_bh(&qitem_lock);
-	list_for_each_safe(l, n, &signal_queue_head) {
-		item = list_entry(l, struct queue_item, next_signal);
-		list_del(&item->next_signal);
-		kmem_cache_free(tipc_queue_item_cache, item);
-	}
-	spin_unlock_bh(&qitem_lock);
-
-	kmem_cache_destroy(tipc_queue_item_cache);
-}