diff options
Diffstat (limited to 'net/tipc/handler.c')
| -rw-r--r-- | net/tipc/handler.c | 134 |
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 @@ | |||
| 1 | /* | ||
| 2 | * net/tipc/handler.c: TIPC signal handling | ||
| 3 | * | ||
| 4 | * Copyright (c) 2000-2006, Ericsson AB | ||
| 5 | * Copyright (c) 2005, Wind River Systems | ||
| 6 | * All rights reserved. | ||
| 7 | * | ||
| 8 | * Redistribution and use in source and binary forms, with or without | ||
| 9 | * modification, are permitted provided that the following conditions are met: | ||
| 10 | * | ||
| 11 | * 1. Redistributions of source code must retain the above copyright | ||
| 12 | * notice, this list of conditions and the following disclaimer. | ||
| 13 | * 2. Redistributions in binary form must reproduce the above copyright | ||
| 14 | * notice, this list of conditions and the following disclaimer in the | ||
| 15 | * documentation and/or other materials provided with the distribution. | ||
| 16 | * 3. Neither the names of the copyright holders nor the names of its | ||
| 17 | * contributors may be used to endorse or promote products derived from | ||
| 18 | * this software without specific prior written permission. | ||
| 19 | * | ||
| 20 | * Alternatively, this software may be distributed under the terms of the | ||
| 21 | * GNU General Public License ("GPL") version 2 as published by the Free | ||
| 22 | * Software Foundation. | ||
| 23 | * | ||
| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| 25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
| 28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| 34 | * POSSIBILITY OF SUCH DAMAGE. | ||
| 35 | */ | ||
| 36 | |||
| 37 | #include "core.h" | ||
| 38 | |||
| 39 | struct queue_item { | ||
| 40 | struct list_head next_signal; | ||
| 41 | void (*handler) (unsigned long); | ||
| 42 | unsigned long data; | ||
| 43 | }; | ||
| 44 | |||
| 45 | static struct kmem_cache *tipc_queue_item_cache; | ||
| 46 | static struct list_head signal_queue_head; | ||
| 47 | static DEFINE_SPINLOCK(qitem_lock); | ||
| 48 | static int handler_enabled __read_mostly; | ||
| 49 | |||
| 50 | static void process_signal_queue(unsigned long dummy); | ||
| 51 | |||
| 52 | static DECLARE_TASKLET_DISABLED(tipc_tasklet, process_signal_queue, 0); | ||
| 53 | |||
| 54 | |||
| 55 | unsigned int tipc_k_signal(Handler routine, unsigned long argument) | ||
| 56 | { | ||
| 57 | struct queue_item *item; | ||
| 58 | |||
| 59 | spin_lock_bh(&qitem_lock); | ||
| 60 | if (!handler_enabled) { | ||
| 61 | spin_unlock_bh(&qitem_lock); | ||
| 62 | return -ENOPROTOOPT; | ||
| 63 | } | ||
| 64 | |||
| 65 | item = kmem_cache_alloc(tipc_queue_item_cache, GFP_ATOMIC); | ||
| 66 | if (!item) { | ||
| 67 | pr_err("Signal queue out of memory\n"); | ||
| 68 | spin_unlock_bh(&qitem_lock); | ||
| 69 | return -ENOMEM; | ||
| 70 | } | ||
| 71 | item->handler = routine; | ||
| 72 | item->data = argument; | ||
| 73 | list_add_tail(&item->next_signal, &signal_queue_head); | ||
| 74 | spin_unlock_bh(&qitem_lock); | ||
| 75 | tasklet_schedule(&tipc_tasklet); | ||
| 76 | return 0; | ||
| 77 | } | ||
| 78 | |||
| 79 | static void process_signal_queue(unsigned long dummy) | ||
| 80 | { | ||
| 81 | struct queue_item *__volatile__ item; | ||
| 82 | struct list_head *l, *n; | ||
| 83 | |||
| 84 | spin_lock_bh(&qitem_lock); | ||
| 85 | list_for_each_safe(l, n, &signal_queue_head) { | ||
| 86 | item = list_entry(l, struct queue_item, next_signal); | ||
| 87 | list_del(&item->next_signal); | ||
| 88 | spin_unlock_bh(&qitem_lock); | ||
| 89 | item->handler(item->data); | ||
| 90 | spin_lock_bh(&qitem_lock); | ||
| 91 | kmem_cache_free(tipc_queue_item_cache, item); | ||
| 92 | } | ||
| 93 | spin_unlock_bh(&qitem_lock); | ||
| 94 | } | ||
| 95 | |||
| 96 | int tipc_handler_start(void) | ||
| 97 | { | ||
| 98 | tipc_queue_item_cache = | ||
| 99 | kmem_cache_create("tipc_queue_items", sizeof(struct queue_item), | ||
| 100 | 0, SLAB_HWCACHE_ALIGN, NULL); | ||
| 101 | if (!tipc_queue_item_cache) | ||
| 102 | return -ENOMEM; | ||
| 103 | |||
| 104 | INIT_LIST_HEAD(&signal_queue_head); | ||
| 105 | tasklet_enable(&tipc_tasklet); | ||
| 106 | handler_enabled = 1; | ||
| 107 | return 0; | ||
| 108 | } | ||
| 109 | |||
| 110 | void tipc_handler_stop(void) | ||
| 111 | { | ||
| 112 | struct list_head *l, *n; | ||
| 113 | struct queue_item *item; | ||
| 114 | |||
| 115 | spin_lock_bh(&qitem_lock); | ||
| 116 | if (!handler_enabled) { | ||
| 117 | spin_unlock_bh(&qitem_lock); | ||
| 118 | return; | ||
| 119 | } | ||
| 120 | handler_enabled = 0; | ||
| 121 | spin_unlock_bh(&qitem_lock); | ||
| 122 | |||
| 123 | tasklet_kill(&tipc_tasklet); | ||
| 124 | |||
| 125 | spin_lock_bh(&qitem_lock); | ||
| 126 | list_for_each_safe(l, n, &signal_queue_head) { | ||
| 127 | item = list_entry(l, struct queue_item, next_signal); | ||
| 128 | list_del(&item->next_signal); | ||
| 129 | kmem_cache_free(tipc_queue_item_cache, item); | ||
| 130 | } | ||
| 131 | spin_unlock_bh(&qitem_lock); | ||
| 132 | |||
| 133 | kmem_cache_destroy(tipc_queue_item_cache); | ||
| 134 | } | ||
