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drivers/connector/cn_queue.c
3.84 KB
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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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* 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 * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/list.h> #include <linux/workqueue.h> #include <linux/spinlock.h> #include <linux/slab.h> #include <linux/skbuff.h> #include <linux/suspend.h> #include <linux/connector.h> #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, struct cb_id *id, |
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void (*callback)(struct cn_msg *, struct netlink_skb_parms *)) |
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{ struct cn_callback_entry *cbq; cbq = kzalloc(sizeof(*cbq), GFP_KERNEL); if (!cbq) { printk(KERN_ERR "Failed to create new callback queue. "); return NULL; } |
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atomic_set(&cbq->refcnt, 1); atomic_inc(&dev->refcnt); cbq->pdev = dev; |
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snprintf(cbq->id.name, sizeof(cbq->id.name), "%s", name); 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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void cn_queue_release_callback(struct cn_callback_entry *cbq) |
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{ |
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if (!atomic_dec_and_test(&cbq->refcnt)) return; atomic_dec(&cbq->pdev->refcnt); |
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kfree(cbq); } int cn_cb_equal(struct cb_id *i1, struct cb_id *i2) { return ((i1->idx == i2->idx) && (i1->val == i2->val)); } |
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int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name, struct cb_id *id, |
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void (*callback)(struct cn_msg *, struct netlink_skb_parms *)) |
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{ struct cn_callback_entry *cbq, *__cbq; int found = 0; |
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cbq = cn_queue_alloc_callback_entry(dev, name, id, callback); |
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if (!cbq) return -ENOMEM; |
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spin_lock_bh(&dev->queue_lock); 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; break; } } if (!found) list_add_tail(&cbq->callback_entry, &dev->queue_list); spin_unlock_bh(&dev->queue_lock); if (found) { |
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cn_queue_release_callback(cbq); |
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return -EINVAL; } |
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cbq->seq = 0; |
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cbq->group = cbq->id.id.idx; |
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return 0; } void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id) { struct cn_callback_entry *cbq, *n; int found = 0; spin_lock_bh(&dev->queue_lock); 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); found = 1; break; } } spin_unlock_bh(&dev->queue_lock); |
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if (found) 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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{ struct cn_queue_dev *dev; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return NULL; snprintf(dev->name, sizeof(dev->name), "%s", name); atomic_set(&dev->refcnt, 0); INIT_LIST_HEAD(&dev->queue_list); spin_lock_init(&dev->queue_lock); dev->nls = nls; |
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return dev; } void cn_queue_free_dev(struct cn_queue_dev *dev) { struct cn_callback_entry *cbq, *n; |
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spin_lock_bh(&dev->queue_lock); list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) list_del(&cbq->callback_entry); spin_unlock_bh(&dev->queue_lock); while (atomic_read(&dev->refcnt)) { printk(KERN_INFO "Waiting for %s to become free: refcnt=%d. ", dev->name, atomic_read(&dev->refcnt)); msleep(1000); } kfree(dev); dev = NULL; } |