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1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* cn_queue.c
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*
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* 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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* All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/suspend.h>
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#include <linux/connector.h>
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#include <linux/delay.h>
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static struct cn_callback_entry *
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cn_queue_alloc_callback_entry(struct cn_queue_dev *dev, const char *name,
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struct cb_id *id,
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void (*callback)(struct cn_msg *,
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struct netlink_skb_parms *))
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{
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struct cn_callback_entry *cbq;
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cbq = kzalloc(sizeof(*cbq), GFP_KERNEL);
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if (!cbq) {
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pr_err("Failed to create new callback queue.\n");
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return NULL;
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}
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refcount_set(&cbq->refcnt, 1);
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atomic_inc(&dev->refcnt);
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cbq->pdev = dev;
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snprintf(cbq->id.name, sizeof(cbq->id.name), "%s", name);
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memcpy(&cbq->id.id, id, sizeof(struct cb_id));
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cbq->callback = callback;
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return cbq;
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}
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void cn_queue_release_callback(struct cn_callback_entry *cbq)
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{
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if (!refcount_dec_and_test(&cbq->refcnt))
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return;
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atomic_dec(&cbq->pdev->refcnt);
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kfree(cbq);
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}
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int cn_cb_equal(struct cb_id *i1, struct cb_id *i2)
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{
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return ((i1->idx == i2->idx) && (i1->val == i2->val));
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}
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int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
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struct cb_id *id,
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void (*callback)(struct cn_msg *,
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struct netlink_skb_parms *))
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{
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struct cn_callback_entry *cbq, *__cbq;
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int found = 0;
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cbq = cn_queue_alloc_callback_entry(dev, name, id, callback);
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if (!cbq)
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return -ENOMEM;
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spin_lock_bh(&dev->queue_lock);
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list_for_each_entry(__cbq, &dev->queue_list, callback_entry) {
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if (cn_cb_equal(&__cbq->id.id, id)) {
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found = 1;
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break;
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}
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}
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if (!found)
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list_add_tail(&cbq->callback_entry, &dev->queue_list);
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spin_unlock_bh(&dev->queue_lock);
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if (found) {
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cn_queue_release_callback(cbq);
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return -EINVAL;
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}
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cbq->seq = 0;
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cbq->group = cbq->id.id.idx;
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return 0;
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}
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void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id)
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{
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struct cn_callback_entry *cbq, *n;
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int found = 0;
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spin_lock_bh(&dev->queue_lock);
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list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) {
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if (cn_cb_equal(&cbq->id.id, id)) {
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list_del(&cbq->callback_entry);
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found = 1;
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break;
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}
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}
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spin_unlock_bh(&dev->queue_lock);
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if (found)
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cn_queue_release_callback(cbq);
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}
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struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *nls)
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{
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struct cn_queue_dev *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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snprintf(dev->name, sizeof(dev->name), "%s", name);
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atomic_set(&dev->refcnt, 0);
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INIT_LIST_HEAD(&dev->queue_list);
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spin_lock_init(&dev->queue_lock);
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dev->nls = nls;
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return dev;
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}
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void cn_queue_free_dev(struct cn_queue_dev *dev)
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{
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struct cn_callback_entry *cbq, *n;
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spin_lock_bh(&dev->queue_lock);
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list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry)
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list_del(&cbq->callback_entry);
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spin_unlock_bh(&dev->queue_lock);
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while (atomic_read(&dev->refcnt)) {
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pr_info("Waiting for %s to become free: refcnt=%d.\n",
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dev->name, atomic_read(&dev->refcnt));
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msleep(1000);
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}
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kfree(dev);
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dev = NULL;
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}
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