| /* |
| * Copyright 2010 Hauke Mehrtens <hauke@hauke-m.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Backport functionality introduced in Linux 2.6.36. |
| */ |
| |
| #include <linux/compat.h> |
| #include <linux/usb.h> |
| |
| #ifdef CPTCFG_BACKPORT_OPTION_USB_URB_THREAD_FIX |
| /* Callers must hold anchor->lock */ |
| static void __usb_unanchor_urb(struct urb *urb, struct usb_anchor *anchor) |
| { |
| urb->anchor = NULL; |
| list_del(&urb->anchor_list); |
| usb_put_urb(urb); |
| if (list_empty(&anchor->urb_list)) |
| wake_up(&anchor->wait); |
| } |
| |
| /** |
| * usb_get_from_anchor - get an anchor's oldest urb |
| * @anchor: the anchor whose urb you want |
| * |
| * this will take the oldest urb from an anchor, |
| * unanchor and return it |
| */ |
| struct urb *usb_get_from_anchor(struct usb_anchor *anchor) |
| { |
| struct urb *victim; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&anchor->lock, flags); |
| if (!list_empty(&anchor->urb_list)) { |
| victim = list_entry(anchor->urb_list.next, struct urb, |
| anchor_list); |
| usb_get_urb(victim); |
| __usb_unanchor_urb(victim, anchor); |
| } else { |
| victim = NULL; |
| } |
| spin_unlock_irqrestore(&anchor->lock, flags); |
| |
| return victim; |
| } |
| EXPORT_SYMBOL_GPL(usb_get_from_anchor); |
| |
| /** |
| * usb_scuttle_anchored_urbs - unanchor all an anchor's urbs |
| * @anchor: the anchor whose urbs you want to unanchor |
| * |
| * use this to get rid of all an anchor's urbs |
| */ |
| void usb_scuttle_anchored_urbs(struct usb_anchor *anchor) |
| { |
| struct urb *victim; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&anchor->lock, flags); |
| while (!list_empty(&anchor->urb_list)) { |
| victim = list_entry(anchor->urb_list.prev, struct urb, |
| anchor_list); |
| __usb_unanchor_urb(victim, anchor); |
| } |
| spin_unlock_irqrestore(&anchor->lock, flags); |
| } |
| EXPORT_SYMBOL_GPL(usb_scuttle_anchored_urbs); |
| |
| #endif /* CPTCFG_BACKPORT_OPTION_USB_URB_THREAD_FIX */ |
| |
| struct workqueue_struct *system_wq __read_mostly; |
| struct workqueue_struct *system_long_wq __read_mostly; |
| struct workqueue_struct *system_nrt_wq __read_mostly; |
| EXPORT_SYMBOL_GPL(system_wq); |
| EXPORT_SYMBOL_GPL(system_long_wq); |
| EXPORT_SYMBOL_GPL(system_nrt_wq); |
| |
| int schedule_work(struct work_struct *work) |
| { |
| return queue_work(system_wq, work); |
| } |
| EXPORT_SYMBOL_GPL(schedule_work); |
| |
| int schedule_delayed_work(struct delayed_work *dwork, |
| unsigned long delay) |
| { |
| return queue_delayed_work(system_wq, dwork, delay); |
| } |
| EXPORT_SYMBOL_GPL(schedule_delayed_work); |
| |
| void flush_scheduled_work(void) |
| { |
| /* |
| * It is debatable which one we should prioritize first, lets |
| * go with the old kernel's one first for now (keventd_wq) and |
| * if think its reasonable later we can flip this around. |
| */ |
| flush_workqueue(system_wq); |
| flush_scheduled_work(); |
| } |
| EXPORT_SYMBOL_GPL(flush_scheduled_work); |
| |
| void backport_system_workqueue_create(void) |
| { |
| system_wq = alloc_workqueue("events", 0, 0); |
| system_long_wq = alloc_workqueue("events_long", 0, 0); |
| system_nrt_wq = create_singlethread_workqueue("events_nrt"); |
| BUG_ON(!system_wq || !system_long_wq || !system_nrt_wq); |
| } |
| |
| void backport_system_workqueue_destroy(void) |
| { |
| destroy_workqueue(system_wq); |
| destroy_workqueue(system_long_wq); |
| destroy_workqueue(system_nrt_wq); |
| } |